How to calculate 81 multiplied by 15 using long multiplication. Here is step-by-step how to calculate 81 times 15 using long multiplication:
Step 1: Setup
Set up your multiplication problem like this:
| 8 | 1 | |||||||
| x | 1 | 5 | ||||||
Step 2: Multiply
1 x 5 = 5. Put 5 below the line and 0 as a reminder on top:
| 0 | ||||||||
| 8 | 1 | |||||||
| x | 1 | 5 | ||||||
| 5 |
Step 3: Multiply
5 x 8 = 40. Take 40 and add 0 from the previous step to get 40. Enter 40 at the bottom:
| 8 | 1 | |||||||
| x | 1 | 5 | ||||||
| 4 | 0 | 5 |
Step 4: Add 0
Enter a 0 at the bottom right as a place holder, because you now move over one digit:
| 8 | 1 | |||||||
| x | 1 | 5 | ||||||
| 4 | 0 | 5 | ||||||
| + | 0 |
Step 5: Multiply
1 x 1 = 1. Put 1 below the line and 0 as a reminder on top:
| 0 | ||||||||
| 8 | 1 | |||||||
| x | 1 | 5 | ||||||
| 4 | 0 | 5 | ||||||
| + | 1 | 0 |
Step 6: Multiply
1 x 8 = 8. Take 8 and add 0 from the previous step to get 8. Enter 8 at the bottom:
| 8 | 1 | |||||||
| x | 1 | 5 | ||||||
| 4 | 0 | 5 | ||||||
| + | 8 | 1 | 0 |
Step 7: Add to get answer
Add up the bottom two numbers (405 + 810 = 1215) to get the answer:
| 8 | 1 | |||||||
| x | 1 | 5 | ||||||
| 4 | 0 | 5 | ||||||
| + | 8 | 1 | 0 | |||||
| = | 1 | 2 | 1 | 5 |
The bottom line is the answer. Therefore, 81 times 15 equals:
1215
Long Multiplication Calculator
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How to calculate 82 multiplied by 15
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