Lesson Title / Date
Learning Goal (Curriculum Expectations)
Near Doubles plus or minus one can be used to solve addition problems
Lesson Components / Anticipated Student Responses
Before
Remind the students of the work they did with doubles.
Ask: How can we use doubles to help us answer,
7 + 8 = ?
Explain that it is about the process of how we answer a question rather than the answer itself. Have a student come up and explain how they can use what they already know about doubles to help them
7 + 7 = 14
7 + 8 = 15 (8 is one more than 7 so the answer is one more)
During
Worksheet with questions on asking students to use doubles to solve various questions.
Word problem:
There are 8 people in the shallow end of the pool and 9 in the deep end of the pool. How many people are in the pool. Use near doubles to help you solve the problem. Substitute 80 and 90 for grade 3. Have the students justify how they solved the problem using near doubles.
After (Consolidation)
Congress: Choose several students to showcase their thinking. Have them show how they solved the problem.
Assess if students need more practise with near doubles. If more practise is needed do not move on. / How did you solve the problem?
What strategy did you use to solve the problem?
Could you use another strategy to solve the problem?
How could using near doubles help you solve a math problem?
Can you double any number to help you with near doubles?
What do you notice about the near doubles?
When you double a number is it always an odd number? Why?
Can you use addition and subtraction when using near doubles?
After (Highlights and Summary)
Co- create Student Success Criteria for Near Doubles with the students.
Co-create or re-iterate with the students the Success Criteria for problem solving if you have not already done so.
-Read the question, highlight the important information
-Make a Plan
-Carry out the plan
-Look back at your answer to determine if it is reasonable
After (Practice)
On the playground 6 (60) students want to play soccer, 7 (70) students want to play Four Square. How many students are on the playground? Use the near doubles strategy of plus one and minus one to help you solve the problem.
Near Doubles: Use doubles plus one or minus one strategy to help you find the answers to the questions.
What doubles could you use to answer the question?
6 + 7 = ______4 + 3 = ______
______+ ______= ______+ ______= ______
______+ ______= ______+ ______= ______
5 + 6 = ______8 + 9 = ______
______+ ______= ______+ ______= ______
______+ ______= ______+ ______= ______
7 + 8 = ______10 + 9 = ______
______+ ______= ______+ ______= ______
______+ ______= ______+ ______= ______
There are 8 people in the shallow end of the pool and 9 in the deep end of the pool. How many people are in the pool? Use the near doubles strategy to help you solve the problem.
Show your work.
Explain your thinking.
______
Near Doubles: Use the doubles plus one or minus one strategy to help you find the answers to the questions.
What doubles could you use to answer the question?
60 + 70 = ______40 + 30 = ______
______+ ______= ______+ ______= ______
______+ ______= ______+ ______= ______
50 + 60 = ______80 + 90 = ______
______+ ______= ______+ ______= ______
______+ ______= ______+ ______= ______
70 + 80 = ______100 + 90 = ______
______+ ______= ______+ ______= ______
______+ ______= ______+ ______= ______
There are 80 people in the shallow end of the pool and 90 in the deep end of the pool. How many people are in the pool? Use the near doubles strategy to help you solve the problem.
Show your work.
Explain your thinking.
______