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

Add the 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

Add the tens.

___ tens + ___ tens = ___ tens

So, 5 × 16 = ___

Answer:

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

Add the 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 = ___

Answer:

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 = ___

Answer:

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

Add the tens.

___ tens + ___ tens = ___ tens

Regroup the tens.

___ tens = ___ hundreds = ___ tens

So, 5 × 78 = ___

Answer:

**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

Add the tens.

___ tens + ___ tens = ___ tens

Step 3

Multiply the hundreds.

4 × ___ hundred = ___ hundreds

So, 4 × 115 = ____

Answer:

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

Add the 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

Add the hundreds.

___ hundred + ___ hundreds

= ___ hundreds

So, 4 × 242 = ____

Answer:

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

Add the 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

Add the tens

__ tens + ___ tens = __ tens

Regroup the tens

__ tens = ___ hundreds __ tens

Step 3

Multiply the hundreds by 5.

5 × ___ hundred = ___ hundreds

Add the hundreds.

___ hundreds + ___ hundreds

= ___ hundreds

So, 5 × 145 = ____

Answer:

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

Add the tens

20 tens + 5 tens = 25 tens

Regroup the tens

25 tens = 2 hundreds 5 tens

Step 3

Multiply the hundreds by 5.

5 × 1 hundred = 5 hundreds

Add the hundreds.

5 hundreds +2 hundreds

= 7 hundreds

So, 5 × 145 = 725.