# Math in Focus Grade 3 Chapter 7 Practice 3 Answer Key Multiplying Ones, Tens, and Hundreds with Regrouping

Go through the Math in Focus Grade 3 Workbook Answer Key Chapter 7 Practice 3 Multiplying Ones, Tens, and Hundreds with Regrouping to finish your assignments.

## Math in Focus Grade 3 Chapter 7 Practice 3 Answer Key Multiplying Ones, Tens, and Hundreds with Regrouping

Fill in the missing numbers.

Example
3 × 26 = ?
Step 1
Multiply the ones by 3.

3 × 6 ones = 18 ones
Regroup the ones.
18 ones = 1 ten 8 ones
Step 2
Multiply the tens by 3.
3 × 2 tens = 6 tens
1 ten + 6 tens = 7 tens
So, 3 × 26 = 78.

Fill in the missing numbers.

Question 1.
5 × 16 = ?

Step 1
Multiply the ones by 5.
5 × ___ ones = ___ ones
Regroup the ones.
___ ones = ___ tens ___ ones
Step 2
Multiply the tens by 5.
5 × ___ tens = ___ tens
___ tens + ___ tens = ___ tens
So, 5 × 16 = ___
5 × 16 = 80.

Explanation:
Here we will multiply the ones by 5 which is
5 × 6 ones = 30 ones
then we will regroup the ones which is
30 ones = 3 tens 1 ones
Step 2
Multiply the tens by 5.
5 × 1 tens = 50 tens
50 tens + 30 tens = 80 tens
So, 5 × 16 = 80.

Fill in the missing numbers.

Question 2.
4 × 82 = ?

Step 1
Multiply the ones by 5.
4 × ___ ones = ___ ones
Step 2
Multiply the tens by 4.
4 × ___ tens = ___ tens
Regroup the tens.
___ tens = ___ hundreds ___ tens
So, 4 × 82 = ___
4 × 82 = 328.

Explanation:
Multiply the ones by 5.
4 × 2 ones = 8 ones
Step 2
Multiply the tens by 4.
4 × 8 tens = 32 tens
Regroup the tens.
320 tens = 3 hundreds 20 tens
So, 4 × 82 = 328.

Fill in the missing numbers.

Question 6.
5 × 78 = ?
Step 1
Multiply the ones by 5.
5 × ___ ones = ___ ones
Step 2
Multiply the tens by 5.
5 × ___ tens = ___ tens
Regroup the tens.
___ tens = ___ hundreds ___ tens
So, 5 × 78 = ___
5 × 78 = 390.

Explanation:
Step 1
Multiply the ones by 5.
5 × 8 ones = 40 ones
Step 2
Multiply the tens by 5.
5 × 7 tens = 350 tens
Regroup the tens.
350 tens = 3 hundreds 50 tens
So, 5 × 78 = 390.

Fill in the missing numbers.

Question 3.
4 × 115 = ?
Step 1

Multiply the ones by 5.
4 × ___ ones = ___ ones
Regroup the ones.
___ ones = ___ tens ___ ones
Step 2
Multiply the tens by 4.
4 × ___ ten = ___ tens
___ tens + ___ tens = ___ tens
Regroup the tens.
___ tens = ___ hundreds = ___ tens
So, 5 × 78 = ___

Fill in the missing numbers.

Question 4.
4 × 115 = ?
Step 1

Multiply the ones by 5.
4 × ___ ones = ___ ones
Regroup the ones.
___ ones = ___ tens ___ ones
Step 2
Multiply the tens by 4.
4 × ___ ten = ___ tens
___ tens + ___ tens = ___ tens
Step 3
Multiply the hundreds.
4 × ___ hundred = ___ hundreds
So, 4 × 115 = ____
4 × 115 = 460.

Explanation:
Multiply the ones by 4.
4 × 5 ones = 20 ones
Regroup the ones.
20 ones = 2 tens 0 ones
Step 2
Multiply the tens by 4.
4 × 1 ten = 4 tens
4 tens + 2 tens = 6 tens
Step 3
Multiply the hundreds.
4 × 1 hundred = 4 hundreds
So, 4 × 115 = 460.

Question 5.
4 × 242 = ?
Step 1

Multiply the ones by 4.
4 × ___ ones = ___ ones
Step 2
Multiply the tens by 4.
4 × ___ tens = ___ tens
Regroup the tens.
___ tens = ___ hundred ___ tens
Step 3
Multiply the hundreds by 4.
4 × ___ hundreds = ___ hundreds
___ hundred + ___ hundreds
= ___ hundreds
So, 4 × 242 = ____
4 × 242 = 968.

Explanation:
Multiply the ones by 4.
4 × 2 ones = 8 ones
Step 2
Multiply the tens by 4.
4 × 4 tens = 4 tens
Regroup the tens.
12 tens = 1 hundred 2 tens
Step 3
Multiply the hundreds by 4.
4 × 2 hundreds = 8 hundreds
8 hundred + 1 hundreds
= 9 hundreds
So, 4 × 242 = 968.

Fill in the missing numbers.

Question 6.
5 × 145 = ?
Step 1

Multiply the ones by 5.
5 × ___ ones = ___ ones
Regroup the tens.
___ ones = ___ tens ___ ones
Step 2
Multiply the tens by 5.
5 × ___ tens = ___ tens
__ tens + ___ tens = __ tens
Regroup the tens
__ tens = ___ hundreds __ tens
Step 3
Multiply the hundreds by 5.
5 × ___ hundred = ___ hundreds
___ hundreds + ___ hundreds
= ___ hundreds
So, 5 × 145 = ____

Explanation:
Multiply the ones by 5.
5 × 5 ones = 25 ones
Regroup the tens.
25 ones = 2 tens 5 ones
Step 2
Multiply the tens by 5.
5 × 4 tens = 20 tens