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Multiplying Two- and Three- Digit Numbers by a One- Digit Number.

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Presentation on theme: "Multiplying Two- and Three- Digit Numbers by a One- Digit Number."— Presentation transcript:

1 Multiplying Two- and Three- Digit Numbers by a One- Digit Number

2 Step 1 Think about 3 groups of 24. 24 3x

3 2 4 3 x Step 2 Multiply the ones. Think: 4 x 3 = 12 2 4 3 x

4 Step 3 Regroup 12 ones as 1 ten and 2 ones. Write down the ones. Carry the tens. 2 4 3 x 2 1

5 Step 4 Then multiply the bottom ones times the tens. Add in the one ten you carried over. Think: 6 tens + 1 ten = 7 tens 7 2 4 3 x 2 1

6 Step 5 Your final answer is 72. 7 2 4 3 x 2 1 Let’s try another problem!

7 Step 1 Think about 5 groups of 45. 45 5x

8 4 5 5 x Step 2 Multiply the ones. Think: 5 x 5 = 25 4 5 5 x

9 Step 3 Regroup 25 ones as 2 tens and 5 ones. Write down the ones. Carry the tens. 4 5 5 x 5 2

10 Step 4 Then multiply the bottom ones times the tens. Add in the two ten you carried over. Think: 20 tens + 2 tens = 22 4 5 5 x 5 2 22

11 Step 5 Your final answer is 225. Let’s try a harder problem! 4 5 5 x 5 2 22

12 Step 1 Think about 4 groups of 364. 64 4x 3

13 Step 2 Multiply the ones. Think: 4 x 4 = 16 6 4 4 x 3 6 4 4 x 3

14 Step 3 Regroup 16 ones as 1 ten and 6 ones. Write down the ones. Carry the tens. 6 1 6 4 4 x 3

15 Step 4 Then multiply the bottom ones times the tens. Add in the one ten you carried over. Think: 24 tens + 1 ten = 25 tens 6 6 4 4 x 3 1

16 Step 5 Regroup 25 tens as two hundreds and five tens. Write down the tens. Carry the hundreds. 6 4 4 x 3 6 1 5 2

17 Step 6 Then multiply the bottom ones times the hundreds. Add in the two hundreds you carried over. Think: 12 hundreds + 2 hundreds = 14 6 6 4 4 x 3 1 2 5

18 Step 7 Your final answer is 1,456. 6 6 4 4 x 3 1 2 51,4 Now try some on your own!


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