I Ll Start Counting, You Keep Going When I Stop
Mental Math Grade 2
MM 2-1
“I’ll start counting, you keep going when I stop.”
1.1, 2, 3,... (4, 5, 6)
2.5, 6, 7,... (8, 9, 10)
3.7, 8, 9,... (10, 11, 12)
Continue with numbers the children know.
MM 2-2
1.“When you count, what number comes
after 7?” (8)
2.What number comes after 4? (5)
3.What number comes after 14? (15)
Continue with numbers the children know.
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1.What is 2 more than 5? (7)
2.What is 2 more than 8? (10)
3.What is 2 more than 7? (9)
4.What is 2 more than 6? (8)
Continue with numbers less than 10.
MM 2-4
1.What is 3 more than 5? (8)
Continue with numbers less than 10.
MM 2-5
“I’ll start counting, you keep going when I stop.”
1.6, 5, 4,... (3, 2, 1)
2.10, 9, 8,... (7, 6, 5)
Continue with numbers the children know.
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1.When you count, what number comes
before 8? (7)
2.What number comes before 15? (14)
Continue with numbers the children know.
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1.What is 2 less than 9? (7)
Continue with numbers the children know.
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1.What is 3 less than 7? (4)
Continue with numbers the children know.
MM 2-9
Present story problems to your children which involve addition. “Peter had 4 blue shirts and 3 brown shirts. How many did he have in all? (7) Jane lost 2 marbles, she only had 2 left. How many did she have before? (4) Frances owned 3 dogs, his mother gave him 2 more. How many dogs does he have now? (5)” Continue. Use the words altogether, in all, find the total, and find the sum. Sums should be less than 10.
MM 2-10
“Blaine had 5 tractors. He lost 4 of them. How many did he have left? (1) Alicia raised 8 hamsters. One day 6 ran away. How many did she have left? (2) Ronald had a pack of gum with 8 pieces in it. He chewed 5 pieces. How many did he have left? (3)” Continue. Use only basic facts through 10.
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1.What is 2 more than 13? (15)
Continue with numbers 10 through 18.
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1.What is 3 more than 11? (14)
Continue with numbers 10 through 18.
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1.What is 6 + 2 + 1? (9)
2.What is 4 + 2 + 0? (6)
Continue adding 3 numbers. Make sure the sum is 10 or less.
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1.Write 38.
2.Write 91.
3.Write 67.
Continue with numbers less than 100.
MM 2-15
1.Write the number that is 2 tens and 4 ones.
(24)
Continue with numbers less than 100 saying the tens place first.
MM 2-16
“I’ll say an addition problem, you tell me if it’s a double or not.”
1.7 + 3. (no)
2.3 + 3. (yes)
3.4 + 4. (yes)
Continue with addition facts through 10.
MM 2-17
1.What is 4 + 4? (8)
2.What is 4 + 5? (9)
3.What is 3 + 3? (6)
4.What is 3 + 4? (7)
Continue presenting doubles, then adding 1 more to the second number. Use the facts through 10.
MM 2-18
1.What number comes between 22 and 24?
(23)
Continue with numbers less than 100.
MM 2-19
1.What is 4 + 5? (9)
2.What is 1 + 6? (7)
3.What is 0 + 7? (7)
Continue with basic facts through 10.
MM 2-20
1.Write an addition problem (fact) that has
an answer of 7. (answers will vary)
Continue with basic facts through 10.
MM 2-21
1.Write a subtraction problem (fact) that has
an answer of 3. (answers will vary)
Continue with basic facts through 10.
MM 2-22
1.Count by 10’s from 0 to 100. (Do this
orally)
2.Write the numbers 0 through 100 counting
by 10’s.
MM 2-23
1.Count by 5’s from 0 to 100. (Do this
orally)
2.Write the numbers 0 through 100 counting
by 5’s.
MM 2-24
1.How many pennies make a nickel? (5)
2.How many pennies make a dime? (10)
3.How many pennies in a quarter? (25)
4.How many pennies in a dollar? (100)
MM 2-25
1.How much is a nickel worth? (5)
2.How much is a dime worth? (10)
3.How much are 2 nickels worth? (10)
4.How much are 2 dimes worth? (20)
Continue with questions using either nickels or dimes, up to a dollar.
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1.How much is 1 nickel and 2 pennies
worth? (7)
2.How much is 1 nickel and 4 pennies
worth? (9)
3.How much is 3 nickels and 2 pennies
worth? (17)
4.How much is 5 nickels and 4 pennies
worth? (29)
Continue with questions using up to 10 nickels and 0 through 5 pennies.
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1.How much is 1 dime and 2 pennies worth?
(12)
2.How much is 1 dime and 4 pennies worth?
(14)
3.How much is 3 dimes and 2 pennies
worth? (32)
4.How much is 7 dimes and 4 pennies
worth? (74)
Continue with questions using up to 10 dimes and 0 through 10 pennies.
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“The kite costs $0.30. Susan has 2 dimes. Can she buy the kite? (no) Susan has 3 dimes. Can she buy the kite? (yes) Susan has 5 nickels. Can she buy the kite? (no) Susan has 6 nickels. Can she buy the kite? (yes) Susan has 30 pennies. Can she buy the kite? (yes) Susan has 10 pennies. Can she buy the kite? (no)
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1.Which is more, 32 or 56? (56)
2.63 or 22? (63)
3.47 or 89? (89)
Continue with numbers less than 100.
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1.Which is less, 41 or 23? (23)
2.15 or 51? (15)
3.40 or 10? (10)
Continue with numbers less than 100.
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1.Write the number that is 5 ones and 3 tens.
(35)
2.7 ones and 4 tens (47)
3.0 ones and 2 tens. (20)
Continue with numbers less than 100 saying the one’s place first.
MM 2-32
I’ll say an addition problem, you tell me if it’s a double or not.
1.6 + 7 (no)
2.8 + 8 (yes)
3.5 + 3 (no)
Continue with addition facts 10 through 18.
MM 2-33
1.What is 4 + 4? (8)
2.What is 4 + 5? (9)
3.What is 6 + 6? (12)
4.What is 6 + 7? (13)
5.What is 8 + 8? (16)
6.What is 8 + 9? (17)
Use basic facts to 18.
MM 2-34
“I’ll say an addition fact, you tell me what double you’d use to help you.”
1.4 + 5. (4 + 4 or 5 + 5)
2.6 + 7. (6 + 6 or 7 + 7)
3.8 + 9. (8 + 8 or 9 + 9)
4.3 + 4. (3 + 3 or 4 + 4)
5.7 + 8. (7 + 7 or 8 + 8)
Continue with addition problems with numbers which are different from each other. Use basic facts to 18.
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1.What is 6 + 7? (13)
2.What is 5 + 8? (13)
3.What is 9 + 6? (15)
Continue with basic facts through 18.
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“Billy had 7 cars. His mother gave him 6 more. How many does he have now? (13)” Continue with story problems using facts to 18.
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“Martha had 6 pencils. She got 3 more from Nancy and 2 more from John. How many does Martha have now?” (11)
“Paul has 8 marbles. He wins 7 from Sean and 2 more from Kent. How many does he have now?” (17)
Continue with problems using facts to 18.
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1.Write the number that comes before 60.
(59)
2.Write the number that comes before 38.
(37)
Continue with numbers less than 100.
MM 2-39
1.Write the number that comes after 36.
(37)
2.Write the number that comes after 21.
(22)
3.Write the number that comes after 45.
(46)
Continue with numbers less than 100.
MM 2-40
“Let’s make 12. I’ll say a number. You tell me a number to add to mine to make 12.
1.4 (8)
2.6 (6)
3.7 (5)
4.9 (3)
Continue. Try to make other numbers as well.
MM 2-41
1.Draw a circle.
2.Draw a square.
3.Draw a rectangle.
4.Draw a triangle.
5.What is 4 + 6? (10)
6.What is 6 + 8? (14)
7.What is 5 + 7? (12)
8.What is 7 + 9? (16)
9.What is 3 + 5? (8)
Present these numbers with the smaller ones first. If the child can’t answer, ask for the double fact which could help.
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1.What is 6 + 4? (10)
2.What is 8 + 6? (14)
3.What is 7 + 5? (12)
4.What is 9 + 7? (16)
5.What is 5 + 3? (8)
Present these numbers with the larger one first. If the child can’t answer ask for the double fact which could help.
6.What is 4 + 8 + 6? (18)
7.What is 3 + 9 + 7? (19)
8.What is 6 + 6 + 4? (16)
9.What is 1 + 8 + 5? (14)
Continue adding 3 numbers which total less than 20.
MM 2-43
“Let’s make 12. I’ll say a number. You tell me a number to add to mine to make 12.
1.4 (8)
2.6 (6)
3.7 (5)
4. 9 (3)
Continue. Try to make other numbers as well.
“Start with 6 and follow me. Add 7. Add 2. Add 4. Add 2. (21) Start with 7 and follow me. Add 2. Add 3. Add 4. Add 1. (17) Start with 4 and follow me. Add 5. Add 3. Add 4. Add 2. (18)” Continue with problems of this type.
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“Jack has 4 white dogs, 3 black dogs and 2 cats. How many dogs does Jack have?” (7)
“Millie’s dog buried four old bones, two newspapers, three new bones, and two rubber animals. How many bones did he bury?” (7)
“Mr. Brown gave Jack 3 pieces of candy and 2 pieces of gum. Mrs. Jans gave Jack 2 pieces of candy and 5 pieces of gum. How many pieces of gum does Jack have?” (7)
Continue to ask questions which have additional information in them.
MM 2-45
1.What is 2 less than 5? (3)
2.What is 1 less than 7? (6)
3.What is 3 less than 6? (3)
4.What is 0 less than 9? (9)
Repeat for numbers less than 10. Use only 0, 1, 2, or 3 less than.
5.What is 7 minus 1? (6)
6.What is 8 minus 3? (5)
7.What is 10 minus 0? (10)
Repeat for numbers 10 or less. Only minus numbers 0, 1, 2, or 3.
MM 2-46
1.How much bigger is 6 than 4? (2)
2.How much bigger is 7 than 6? (1)
3.How much bigger is 9 than 6? (3)
Repeat for numbers less than 10. Only use numbers which are 0, 1, 2 or 3 apart.
4.What is 6 minus 4? (2)
5.What is 8 minus 7? (1)
6.What is 7 minus 3? (4)
7.What is 9 minus 0? (0)
Repeat with numbers 10 or less. Only minus numbers 0, 1, 2 or 3 apart. Combine with 3.
MM 2-47
“Kim had 7 cookies. She gave 2 cookies to her friend. How many cookies does Kim have left?” (5)
“There are 8 girls in the swings. 3 went away to play. How many are left?” (5)
“Mark had 9 flowers in his garden. Someone took away 1. How many did Mark have left?” (8)
Continue. One of the numbers in each problem should be 0, 1, 2 or 3.
1.What addition fact uses the same numbers
as 7 - 4 = 3? (4 + 3 = 7 or 3 + 4 = 7)
Continue using basic facts through 10.
MM 2-48
“Start with 4 and follow me. Add two. Add three. Subtract 1. Add 2. What is the number? (10)
“Start with 6 and follow me. Subtract 2. Add 3. Add 1. Subtract 3. Add 4. What is the number?” (9)
Continue with problems of this type. Make certain the child can add or subtract the numbers involved.
MM 2-49
“Jeannie has 10 pennies. 6 are in her bank and the rest are in her purse. How many are in her purse?” (4) Continue with problems of this type - where you ask how many were added to get a total.
1.What is 4 + 5? (9)
2.What is 6 + 7? (13)
3.What is 8 + 9? (17)
4.What is 8 + 7? (15)
5.What is 6 + 5? (11)
Present these numbers with the smaller one first. If the child cannot quickly answer, ask them for the related double fact.
MM 2-50
“I have a dime, a nickel, and a penny. How much do I have?” ($0.16)
“I have 2 nickels and 4 pennies. How much do I have?” ($0.14)
Continue with dime, nickel and penny combinations less than $0.25.
MM 2-51
“It is 8:00. What time will it be in 1 hour?” (9:00)
“It is 5:00. What time will it be in 2 hours?” (7:00)
“Count by tens to 100. Now start at 40 and count on by tens. Start at 70 and count back by tens.”
Have the child start at different numbers and count forward and back by tens.
MM 2-52
“It is 6:30. What time will it be in 1 hour?” (7:30)
“It is 3:30. What time will it be in 2 hours?” (5:30)
1.How much is 4 tens? (40)
2.How much is 6 tens? (60)
3.How much is 7 tens? (70)
4.How many tens in 50? (5)
5.How many tens in 30? (3)
6.How many tens in 80? (8) Continue with
questions of this type.
MM 2-53
“Count by 2’s, what comes next?”
22, 24, 26, . (28)
38, 40, 42, . (44)
12, 14, . (16)
84, 86, 88, . (90)
1.What is 10 + 5? (15)
2.What is 10 + 6? (16)
3.What is 10 + 2? (12)
Repeat for numbers between 11 and 19.
4.What is 6 + 10? (16)
5.What is 7 + 10? (17)
6.What is 8 + 10? (18)
7.What is 4 + 10? (14)
8.What is 9 + 10? (19)
MM 2-54
“6 plus what number equals 11?” (5)
Continue using basic facts through 18.
“What number is 10 more than 50? (60) What number is 30 more than 40? (70) What number is 30 less than 50? (20) What number is 10 less than 60? (50)”
Continue with 10, 20 or 30 more or less than a multiple of ten. The child could write the numbers as well.
MM 2-55
“The big hand is on 6. The small hand is between 6 and 7. What time is it? (6:30) The big hand is on 12. The small hand is on 6. What time is it? (6:00)”
Continue with problems of this type using hour and half hour.
“What number is between 36 and 38?” (37)
“What number is between 79 and 81?” (80)
“What number is between 27 and 29?” (28)
The child could write the number as well.
MM 2-56
“Count by 5’s, what comes next?”
5, 10, 15, . (20)
35, 40, 45, . (50)
15, 20, 25, . (30)
40, 45, 50, . (55)
“Start with 40 and count on 3 more.” (43)
“Start with 80 and count on 2 more.” (82)
“Start with 10 and count on 7 more.” (17)
Have the child start at a given number of tens and count on by ones. The child could write the number as well.
MM 2-57
“If 3 + 5 = 8, what is 30 + 50?” (80)
“If 2 + 7 = 9, what is 20 + 70?” (90)
Continue using basic facts 1-10 and multiples of 10.
1.What is 20 + 7? (27)
2.What is 30 + 4? (34)
3.What is 50 + 6? (56)
4.What is 80 + 9? (89)
Repeat for any number between 10 and 100. Emphasize the sounds involved. (50 + 6 = 56)
MM 2-58
“I’m thinking of a number between 20 and 40. This number has a 5 in it. What could it be?” (25 or 35)
“I’m thinking of a number between 40 and 70. The one’s digit is 3. What could it be?” (43, 53, or 63)
Continue with questions of this type. The child could write the answers as well. Let the child ask you questions of this type.
MM 2-59
“I’m thinking of a number between 1 and 100. (58) What is my number? You may ask only questions which can be answered yes or no.” Encourage the student to ask questions like, “Is it bigger than 50?” “Does it have 6 in it?”, etc. Let him/her pick a number and you ask the questions.
MM 2-60
“What number is 7 ones and 3 tens?” (37)
“What number is 6 tens and 4 ones?” (64)
“What number is 5 ones and 1 ten?” (15)
Continue alternating the ones and tens sequence.
“How many days in a week?” (7) “What are the days in a week?”
MM 2-61
1.What is 12 - 5? (7)
2.What is 14 - 8? (6)
3.What is 12 - 4? (8)
4.What is 15 - 7? (8)
5.What is 17 - 8? (9)
6.What is 18 - 9? (9)
7.What is 13 - 8? (5)
Continue with any subtraction fact. Remind the child to use addition facts to help.
“Count by tens to 100. Now start at 40 and count on by tens. Start at 70 and count back by tens.” Have the child start at different numbers of tens and count forward and back by tens.
MM 2-62
1.What is 8 + 2 + 3? (13)
2.What is 5 + 1 + 5? (11)
3.What is 4 + 6 + 2? (12)
4.What is 3 + 3 + 7? (13)
Continue with any 3 numbers that includes a 10 combination.
How many hours in a day? (24)
How many minutes in an hour? (60)
MM 2-63
“Susan has a box with 7 crayons in it. She takes out 3 crayons. How many are in the box now?” (4) “Chuck has 12 carrots in a bag. He takes 4 out. How many were left in the bag?” (8) “A cage in a pet store had 14 birds in it. 6 were sold. How many were still left?” (8) “One board is 13 feet long. Another is 7 feet long. How much longer is the first board?” (6 feet) “Bill has 9 cents. He needs 15 cents to buy a candy bar. How much more does Bill need?” (6 cents)
Continue with subtraction story problems similar to these.
In what month is Thanksgiving? Christmas? Halloween? Valentine’s Day? Independence Day? New Year’s Day? Memorial Day? Easter? Mother’s Day? Father’s Day? St. Patrick’s Day?
MM 2-64
“Mary had 2 nickels. Her mother gave her 3 pennies. How much money does she have?” ($0.13) “Bill has 2 dimes. He wants to buy a card for his mother that costs 17 cents. How much change will he receive?” (3 cents) “Portia saves 3 pennies every day. How long will it take her to save 12 cents?” (4 days) “Paula wants to buy 2 pencils. Each pencil costs 6 cents. How much money does she need?” (12 cents) “Rex has 35 cents. His mother gave him a nickel and a dime. How much does he have now?” (50 cents)
Continue with story problems involving coins.
MM 2-65
“Draw a circle in a square.”
“Draw a triangle in a circle.”
“Draw a triangle in a rectangle.”
“Draw a rectangle in a circle.”
Continue using geometric combinations.
How many seasons in a year? (4) Name them.
MM 2-66
“Using 6, 7 and 13, write the addition and subtraction sentence for the fact family.”
(6 + 7 = 13, 7 + 6 = 13, 13 - 6 = 7, 13 - 7 = 6)
Continue using other fact family combinations.
MM 2-67
Ask subtraction questions which have additional information in them. Pick numbers less than 10.
Examples:
1.Diane had 9 stamps. Ronnie has 7 stamps.
Sue has 12 stamps. How many more
stamps does Diane have than Ronnie? (2)
2.Marty had 5 kids on his baseball team. 3
were girls and 2 were boys. How many
more kids did he need to make a team of
9? (4)
3.A car going to an airport can hold 8
people. 3 seats were empty. Two people
were carrying bags in their laps. How
many seats are full? (5)
MM 2-68
“Start with 6 and follow me. Add 7. Subtract 2. Subtract 6. Add 4. Add 5. Subtract 8.” (6)
Start with 9 and follow me. Add 8. Subtract 6. Subtract 4. Add 5. Subtract 7. Add 4. (9)
Continue with problems of this type.
“What is 1 + 10? (11) 3 + 10? (13) 5 + 10? (15) 2 + 10? (12)” Repeat. For these sums the sounds are not as apparent.
MM 2-69
“What addition fact uses the same numbers as 12 - 5 = 7?” (5 + 7 = 12 or 7 + 5 = 12)
“What addition fact uses the same numbers as 16 - 8 = 8?” (8 + 8 = 16)
“What addition fact uses the same numbers as 14 - 9 = 5?” (9 + 5 = 14 or 5 + 9 = 14)
Continue. Tell the child the subtraction fact then ask for the related addition fact.
“Write all the doubles addition facts through 18.”
MM 2-70
“What addition fact can you think of that would help with the subtraction fact 11 - 5?” (5 + 6 = 11 or 6 + 5 = 11) “So what is the answer to 11 - 5?” (6)
“What addition fact would help with 13 - 6?” (6 + 7 = 13 or 7 + 6 = 13) “So what is the answer? (7)
“How about 15 - 8?” (8 + 7 = 15 or 7 + 8 = 15) Answer? (7)
Continue in this way. Give a subtraction fact and ask for an addition fact, then the answer.
MM 2-71
“Count by 2’s to 100. Start from 0. Count by 2’s to 100. Start with 1.” Continue.
“Say the number that is 5 tens and 2 ones. (52) Say the number that is 7 tens and 4 ones. (74) Say the number that is 9 tens and 1 one. (91) Say the number that is 6 ones and 5 tens. (56) Say the number that is 3 ones and 8 tens. (83)”
Continue with numbers which contain tens and ones and ones and tens.
MM 2-72
“Count by 5’s to 100. Count by 5’s starting with 20, 35, 70, 85.” Continue. “Start counting from a number with 0 or 5 in the ones digit.”
“Count by 10’s starting with 15, 23, 41, 17.” Continue. “What number is 10 more than 26, 38, 61.” Continue. The child could write the number as well.
MM 2-73
“How much is 3 dimes, 1 nickel, and 2 pennies worth?” ($0.37)
“How much is 4 dimes, 2 nickels, and 8 pennies worth?” ($0.58)
“How much is 1 dime, 3 nickels, and 4 pennies worth?” ($0.29)
Continue with questions using up to 9 dimes, up to 7 nickels, and 0 to 9 pennies.
MM 2-74
“Draw a group of coins that equals $0.25.” (answers will vary)
“Draw a group of coins that equals $0.40.”
Continue with values up to $1.
MM 2-75
Show clock with time to 5 min. intervals and ask class to write the digital time.
MM 2-76
Count by 2’s starting from 48, 36, 64, 75, and 17.
MM 2-77
Write the number...
“Which is greater: 6 or 9?” (9)
“Which is less: 7 or 2?” (2)
“Which is greater: 21 or 41?” (41)
“Which is less: 52 or 63?” (52)
Continue with numbers less than 100.
“The big hand is on 3. The small hand is just past 12. What time is it?” (12:15)
MM 2-78
Write the sum of...
1.20 + 50 (70)
2.40 + 10 (50)
3.50 + 50 (100)
Continue with multiples of ten up to and including 100.
Double the number...
4.6 (12)
5.4 (8)
Continue up to 9.
MM 2-79
Write the difference...
1.50 - 30 (20)
2.90 - 40 (50)
Continue with multiples of 10 with the largest number 100 or less.
“I am thinking of a number. The double of that number is...”
3.14 (7)
4.8 (4)
Continue with double numbers to 18.
MM 2-80
“How much is 2 dimes and 1 nickel worth?” ($0.25) “How much is 4 dimes and 2 nickels worth?” ($0.50) “How much is 6 dimes and 3 nickels worth?” ($0.75)