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

2. Step 1
Think about 3 groups of 24. 2 4 3 x

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

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

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

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

7. Step 1
Think about 5 groups of 45. 4 5 x

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

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

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

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

12. Step 1
Think about 4 groups of 364. 6 4 x 3

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

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

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

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

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

18. 6 4 x 3 5 1,4 Step 7 Your final answer is 1,456. 2 1
Now try some on your own!