PR1ME I Whole Class WEEK 2 I DAY 3
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Lesson 2 Problem Solving
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Learn Word problems Evan has z guppies and 21 angelfish. He has 38 fishes altogether. How many of his fishes are guppies ?
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Understand the problem. 1
There are 38 fishes altogether. 21 of the fishes are angelfish. The rest are guppies. I have to find the unknown z , which is the number of guppies.
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Plan what to do. 2
I can form an equation in terms of z to solve the problem.
Answer . 3
Work out the
z + 21 = 38 z + 21 – 21 = 38 – 21 z = 17
I can show this using a bar model.
z
21
Evan has 17 guppies.
1.
38
is correct. 4
Check if your answer
When z = 17 ,
z + 21 = 17 + 21 = 38 ✓
2.
My answer is correct.
3.
1. Understand
2. Plan
3. Answer
4. Check
14
JAN
ISBN 978-981-09-0495-1
Student Handbook, page 50
Grade 7 I Teacher’s Guide 55
G7_Math_PE_WK1-3 004-067.indd 38
7/23/18 9:57 AM
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