Learning Objective Name ______
Today, we will write subtraction number sentences.
CFU
What are we going to do today?
Activate (or provide) Prior Knowledge
Circle the minus sign.
Circle the equal sign.
Solve the subtraction number sentences.
A 7 - 3 = B 3 – 2 =
CFU
Teacher completes A; students complete B. Students, you already know how to solve number sentences. Sometimes we have to read word problems to find the subtraction number sentences that we need to solve. Today, we will write subtraction number sentences.
Concept Development
Subtraction means to take away.
• To write a subtraction number sentence, look for subtraction key words.
CFU
On your whiteboard, write a minus sign.
On your whiteboard, write an equal sign.
Which of the number sentences can be written from the following word problem? How do you know?
A B
In your own words, what does subtraction mean? Subtraction means ______.
Skill Development/Guided Practice
Subtraction means to take away.
• To write a subtraction number sentence, look for subtraction key words.
Write subtraction number sentences.
Step #1: Read the word problem carefully.
a. Identify1 subtraction key words. (underline)
b. Identify number words. (circle)
Step #2: Write a subtraction number sentence. Hint: Remember that the larger number is first.
Step #3: Read the subtraction number sentence aloud. 1 find
1. Jesse has three marbles. He gives two to his sister. Jesse has one marble left.2. Alisha has four marbles. She gives one to her brother. Alisha has three marbles left.
CFU
(#1a) How did I/you identify subtraction key words?
(#1b) How did I/you identify number words?
(#2) How did I/you write a subtraction number sentence?
Skill Development/Guided Practice (continued)
Subtraction means to take away.
• To write a subtraction number sentence, look for subtraction key words.
Write subtraction number sentences.
Step #1: Read the word problem carefully.
a. Identify subtraction key words. (underline)
b. Identify number words. (circle)
Step #2: Write a subtraction number sentence. Hint: Remember that the larger number is first.
Step #3: Read the subtraction number sentence aloud.
3. Juana has five pieces of candy. If she gives her brother three pieces, Juana will have two pieces left.4. Alexis has six pencils. If she gives Jane two pencils, Alexis will have four pencils left.
CFU
(#1a) How did I/you identify subtraction key words?
(#1b) How did I/you identify number words?
(#2) How did I/you write a subtraction number sentence?
Importance
Subtraction means to take away.
• To write a subtraction number sentence, look for subtraction key words.
1. Writing subtraction number sentences will help you solve real world problems.
CFU
Does anyone else have another reason why it is important to write subtraction number sentences? (pair - share) Why is it important to write subtraction number sentences? You may give me my reason or one of your own. Which reason is more important to you? Why?
Subtraction means to take away.• To write a subtraction number sentence, look for subtraction key words.
Concept Closure
5 − 2 = 3
What do the symbols mean?
− ______
= ______
Skill Closure
Write subtraction number sentences.
Step #1: Read the word problem carefully.
a. Identify subtraction key words. (underline)
b. Identify number words. (circle)
Step #2: Write a subtraction number sentence. Hint: Remember that the larger number is first.
Step #3: Solve and read the number sentence.
1. Jamie has six shirts and gives two shirts away. Jamie has four shirts left.
Summary Closure
What did you learn today about writing subtraction number sentences? (pair-share)
Independent Practice Name ______
Subtraction means to take away.
• To write a subtraction number sentence, look for subtraction key words.
Write subtraction number sentences.
Step #1: Read the word problem carefully.
a. Identify subtraction key words. (underline)
b. Identify number words. (circle)
Step #2: Write a subtraction number sentence. Hint: Remember that the larger number is first.
Step #3: Read the subtraction number sentence aloud.
1. Alberto has seven pens and gives away five pens. Alberto has two pens left.2. Ralph has four binders. If he gives his friend George three of them, Ralph has one binder left.
Independent Practice (continued)
Subtraction means to take away.
• To write a subtraction number sentence, look for subtraction key words.
Write subtraction number sentences.
Step #1: Read the word problem carefully.
a. Identify subtraction key words. (underline)
b. Identify number words. (circle)
Step #2: Write a subtraction number sentence. Hint: Remember that the larger number is first.
Step #3: Read the subtraction number sentence aloud.
3. Sarah has seven coins. If she spends two of them on candy, Sarah has five coins left.4. Juan has seven erasers. If he gives Jose six, Juan has one eraser left.
Periodic Review 1 Name______
Subtraction means to take away.
• To write a subtraction number sentence, look for subtraction key words.
Write subtraction number sentences.
Step #1: Read the word problem carefully.
a. Identify subtraction key words. (underline)
b. Identify number words. (circle)
Step #2: Write a subtraction number sentence. Hint: Remember that the larger number is first.
Step #3: Read the subtraction number sentence aloud.
1. Harry has six toy cars. If he gives four of them to his brothers, Harry has two cars left.2. Bob found seven blocks in the front room. He gave his sister six. Bob has one block left.
Periodic Review 2 Name ______
Subtraction means to take away.
• To write a subtraction number sentence, look for subtraction key words.
Write subtraction number sentences.
Step #1: Read the word problem carefully.
a. Identify subtraction key words. (underline)
b. Identify number words. (circle)
Step #2: Write a subtraction number sentence. Hint: Remember that the larger number is first.
Step #3: Read the subtraction number sentence aloud.
1. Jeff has eight marbles. He gives Jane six marbles. Jeff has two marbles left.2. Mary has nine stickers and gives Melissa four. Mary has five stickers left.
Periodic Review 3 Name ______
Subtraction means to take away.
• To write a subtraction number sentence, look for subtraction key words.
Write subtraction number sentences.
Step #1: Read the word problem carefully.
a. Identify subtraction key words. (underline)
b. Identify number words. (circle)
Step #2: Write a subtraction number sentence. Hint: Remember that the larger number is first.
Step #3: Read the subtraction number sentence aloud.
1. Sheila has eight bracelets. She gives four to Alicia. Sheila has four bracelets left.2. Frank has seven toy cars. He gives Harry five toy cars. Frank has two toy cars left.
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Comments? / 1st Grade Algebra Functions 1.1
Write and solve number sentences from problem situations that express relationships involving addition and subtraction.
Lesson to be used by EDI-trained teachers only.