Solution - Long multiplication
60
Step-by-step explanation
1. Rewrite the numbers from top to bottom aligned to the right
| Place value | tens | ones |
| 1 | 5 | |
| × | 4 | |
2. Multiply the numbers using long multiplication method
Start by multiplying the ones digit (4) of the multiplier 4 by each digit of the multiplicand 15, from right to left.
Multiply the ones digit (4) of the multiplicator by the number in the ones place value:
4×5=20
Write 0 in the ones place.
Because the result is greater than 9, carry the 2 to the tens place.
| Place value | tens | ones |
| 2 | ||
| 1 | 5 | |
| × | 4 | |
| 0 |
Multiply the ones digit (4) of the multiplicator by the number in the tens place value and add the carried number (2):
4×1+2=6
Write 6 in the tens place.
| Place value | tens | ones |
| 2 | ||
| 1 | 5 | |
| × | 4 | |
| 6 | 0 |
The solution is: 60
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