# Into Math Grade 5 Module 1 Lesson 3 Answer Key Use a Pattern to Multiply by Multiples of 10, 100, and 1,000

We included HMH Into Math Grade 5 Answer Key PDF Module 1 Lesson 3 Use a Pattern to Multiply by Multiples of 10, 100, and 1,000 to make students experts in learning maths.

## HMH Into Math Grade 5 Module 1 Lesson 3 Answer Key Use a Pattern to Multiply by Multiples of 10, 100, and 1,000

I Can use mental math to find the product of any two numbers that have one nonzero digit and are multiples of 10, 100, or 1,000.

Step It Out

1. Sixty students participate in a jump-a-thon, and each student jumps rope 400 times. What is the total number of jumps?

A. What multiplication equation models the total number of jumps?
_____________
B. Complete the multiplication fact.
6 × 4 = ___
C. Use the fact to complete the pattern.
6 × 40 = (6 × 4) × 101 = ___
6 × 400 = (6 × 4) × 102 = ____
60 × 400 = (6 × 10) × (4 × 102)
= (6 × 4) × (10 × 102)
= (6 × 4) × 103
= ______
D. What is the total number of jumps?
Sixty students participate in a jump-a-thon, and each student jumps rope 400 times.
60 × 400
6 × 4 = 24
6 × 40 = (6 × 4) × 101 = 24 × 10 = 240
6 × 400 = (6 × 4) × 102 = 24 × 100 = 2400
60 × 400 = (6 × 10) × (4 × 102) = 60 × 400 = 24000
= (6 × 4) × (10 × 102)
= (6 × 4) × 103
= 24 × 1000
= 24,000
Thus the total number of jumps were 24,000

Turn and Talk What is the relationship between the number of zeros in the two factors and the number of zeros in the product?

Step It Out

2. Fifty students each jump rope 2000 times during the jump-a-thon.
A. What multiplication equation models the number of jumps completed by the 50 students?

B. Complete the multiplication fact and the pattern.
5 × 2 = ____
5 × 20 = (5 × 2) × 101 = ____
5 × 200 = (5 × 2) × 102 = ___
5 × 2,000 = (5 × 2) × 103 = ___
50 × 2,000 = (5 × 10) × (2 × 103)
= (5 × 2) × (10 × 103)
= (5 × 2) × 104
= _________
C. How many jumps were completed by these students? _______
5 × 2 = 10
5 × 20 = (5 × 2) × 101 = 10 × 10 = 100
5 × 200 = (5 × 2) × 102 = 10 × 100 = 1000
5 × 2,000 = (5 × 2) × 103 = 10 × 1000 = 10,000
50 × 2,000 = (5 × 10) × (2 × 103)
= (5 × 2) × (10 × 103)
= (5 × 2) × 104
= 10 × 10000
= 100,000
So, 100,000 jumps were completed by these students.

Turn and Talk Why is the total number of zeros in the product not always the same as the total number of zeros in the two factors?

Check Understanding Math Board

Question 1.
The 40 students in Leona’s grade each did 3,000 jumping jacks. How many jumping jacks is this? __________
Given,
The 40 students in Leona’s grade each did 3,000 jumping jacks
3000
× 40
120000

Multiply.

Question 2.
70 × 600 = ____
600
× 70
42000
70 × 600 = 42 × 103

Question 3.
30 × 8,000 = _______
8000
× 30
240000
30 × 8,000 = 24 × 104

Question 4.
____ = 80 × 5,000
5000
×80
400000
80 × 5,000 = 4 × 105

Question 5.
50 × 600 = ____
600
×50
30000
50 × 600 = 3 × 104

Complete the multiplication fact and pattern.

Question 6.
6 × 9 = ___
(6 × 9) × 101 = ____
(6 × 9) × 102 = ____
(6 × 9) × 103 = ___
A multiplication fact is the product of two specific numbers.
6 × 9 = 54
(6 × 9) × 101 = 54 × 10 = 540
(6 × 9) × 102 = 54 × 100 = 5400
(6 × 9) × 103 = 54 × 1000 = 54000

Question 7.
3 × 8 = ___
(3 × 8) × 101 = ____
(3 × 8) × 102 = ____
(3 × 8) × 103 = ___
A multiplication fact is the product of two specific numbers.
3 × 8 = 24
(3 × 8) × 101 = 24 × 10 = 240
(3 × 8) × 102 = 24 × 100 = 2400
(3 × 8) × 103 = 24 × 1000 = 24000

Question 8.
5 × 4 = ___
(5 × 4) × 101 = ____
(5 × 4) × 102 = ____
(5 × 4) × 103 = ___
(5 × 4) × 104 = ___
A multiplication fact is the product of two specific numbers.
5 × 4 = 20
(5 × 4) × 101 = 20 × 10 = 200
(5 × 4) × 102 = 20 × 100 = 2000
(5 × 4) × 103 = 20 × 1000 = 20000
(5 × 4) × 104 = 20 × 10000 = 200000

Question 9.
12 × 8 = ___
(12 × 8) × 101 = ____
(12 × 8) × 102 = ____
(12 × 8) × 103 = ___
(12 × 8) × 104 = ___
A multiplication fact is the product of two specific numbers.
12 × 8 = 96
(12 × 8) × 101 = 96 × 10 = 960
(12 × 8) × 102 = 96 × 100 = 9600
(12 × 8) × 103 = 96 × 1000 = 96000
(12 × 8) × 104 = 96 × 10000 = 960000

Find the unknown number.

Question 10.

Given,
40 × 70,000 = 28 × 10x
2800000 =
28 × 105 = 28 × 10x
105 = 10x
x = 5
So, the unknown number is 5.

Question 11.

Given,
60 × 500 = 3 × 10x
30000 = 3× 10x
3 ×104 = 3× 10x
10x = 104
x = 4
So, the unknown number is 4.

Question 12.

Given,
30 × x = 21 × 106
x = 21 × 106 /30
x = 700,000
So, the unknown number is 700,000.

Question 13.

Given,
50 × x = 2 × 104
50x = 20000
x = 20000/50
x = 400
So, the unknown number is 400.

Multiply.

Question 14.
80 × 400 = ___
400
× 80
32000
80 × 400 = 32 × 103

Question 15.
50 × 200 = ___
200
×50
10000
50 × 200 = 1 × 104

Question 16.
30 × 7,000 = ____
7000
× 30
210,000
30 × 7,000 = 21 × 104

Question 17.
40 × 5,000 = ____
5000
× 40
200,000
20000 can be written as 2 × 105

Question 18.
A shipping company buys 60 trucks for $30,000 each. What is the total cost? ____ Answer: Given, A shipping company buys 60 trucks for$30,000 each.
60 × 30,000 = $1,800,000 So, the total cost is$1,800,000

Question 19.
What is the total weight of 20 similar semi-truck cabs and trailers? ______

The weight of semi truck can is 30,000 lb
The weight of 20 similar semi-truck cabs and trailers is 20 × 30,000 = 600,000 lbs

Question 20.
Thirty other students participate in the jump-a-thon, and they each jump rope 600 times. What is the total number of jumps?
Given,
Thirty other students participate in the jump-a-thon, and they each jumped rope 600 times.
30 × 600 = 18000
The total number of jumps students made is 18,000.

Question 21.
Four hundred students each jump rope 70 times. What is the total number of jumps for this group of students?
Given,
Four hundred students each jump rope 70 times.
400 × 70 = 28000
Thus the group of students jumps 28000 times.

Question 22.
Use Repeated Reasoning A store sells 50 basketball backboards and stands for $700 each. How much does the store earn from these sales? Use a multiplication fact and a pattern. How much does the store earn? ____ Answer: Given, A store sells 50 basketball backboards and stands for$700 each.
50 × $700 =$35,000
Thus the store earns \$35,000 for 50 basketball backboards.

Question 23.
Use Structure How many zeros are in the product of any nonzero whole number and 1,000? Explain your answer.
It depends on the whole number.
Let us take 43 as the whole number.
43 × 1000 = 43000 (3 zeros)
50 × 1000 = 50000 (4 zeros)

Question 24.
Use Repeated Reasoning What is (3 × 102) × (9 × 103)? Use a multiplication fact and a pattern.
What is the product? _______