Page 171 - NUMINO TG_3A

Activity 4 Word Problems

jOb ective Multiply a 2-digit number by a 1-digit number and solve the word problem.

1. Textbook Instructions Activity 4 Word Problems

Have students solve the word problem by 1 . Solve the word problem.
multiplying a 2-digit number by a 1-digit
number. Jessica bought 13 packs of 5 erasers and 17 packs
of 4 pencils.
1. Have students use the following four steps Did Jessica buy more erasers or pencils?
to solve the word problem.
Think about the steps to solve the word problem.
Understand the Question What do you need to find?
Q: What are you trying to find? What do you know?
Q: Did Jessica buy more erasers or How will you solve the problem?
Solve the number sentence.
pencils? Look back.
Q: What do you already know?
A: Jessica bought 13 packs of 5 erasers 98

and 17 packs of 4 pencils.
Plan the Process
Q: How are you going to solve the

problem?
A: By using multiplication.
Solve the Problem
Q: Can you solve this multiplication

sentence?
A: Number of erasers: 13 5 65

Number of pencils: 17 4 68
Therefore, Jessica bought more pencils.
Look back.
Check your answer.

2. Build Understanding

Problem: Find the numbers for A Solution: For B 8, the digit of the product in the ones place
and B and complete the becomes a 0 when B is 5.
sentence. Use natural A 8 4 36
numbers from 1 to 9. A 8 36 4 32
A 32 8 4
AB
8 Answer: A 4, B 5

360

153 NUMINO Teacher s Guide