Solution - Long multiplication
63
Step-by-step explanation
1. Rewrite the numbers from top to bottom aligned to the right
| Place value | tens | ones |
| 2 | 1 | |
| × | 3 | |
2. Multiply the numbers using long multiplication method
Start by multiplying the ones digit (3) of the multiplier 3 by each digit of the multiplicand 21, from right to left.
Multiply the ones digit (3) of the multiplicator by the number in the ones place value:
3×1=3
Write 3 in the ones place.
| Place value | tens | ones |
| 2 | 1 | |
| × | 3 | |
| 3 |
Multiply the ones digit (3) of the multiplicator by the number in the tens place value:
3×2=6
Write 6 in the tens place.
| Place value | tens | ones |
| 2 | 1 | |
| × | 3 | |
| 6 | 3 |
The solution is: 63
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