Solution - Long multiplication
729
Step-by-step explanation
1. Rewrite the numbers from top to bottom aligned to the right
| Place value | hundreds | tens | ones |
| 8 | 1 | ||
| × | 9 | ||
2. Multiply the numbers using long multiplication method
Start by multiplying the ones digit (9) of the multiplier 9 by each digit of the multiplicand 81, from right to left.
Multiply the ones digit (9) of the multiplicator by the number in the ones place value:
9×1=9
Write 9 in the ones place.
| Place value | hundreds | tens | ones |
| 8 | 1 | ||
| × | 9 | ||
| 9 |
Multiply the ones digit (9) of the multiplicator by the number in the tens place value:
9×8=72
Write 2 in the tens place.
Because the result is greater than 9, carry the 7 to the hundreds place.
| Place value | hundreds | tens | ones |
| 7 | |||
| 8 | 1 | ||
| × | 9 | ||
| 7 | 2 | 9 |
The solution is: 729
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