Solution - Long multiplication
Step-by-step explanation
1. Rewrite the numbers from top to bottom aligned to the right
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 1 | 0 | . | 3 | 9 | 2 | |
| × | 3 | |||||
Ignore the decimal points and multiply as if these are whole numbers (as if each most right digit is the ones digit):
In this case we removed 3 decimal place(s). So once calculated, the result will be reduced by the factor of 1,000.
| Place value | ten thousands | thousands | hundreds | tens | ones |
| 1 | 0 | 3 | 9 | 2 | |
| × | 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 10,392, from right to left.
Multiply the ones digit (3) of the multiplicator by the number in the ones place value:
3×2=6
Write 6 in the ones place.
| Place value | ten thousands | thousands | hundreds | tens | ones |
| 1 | 0 | 3 | 9 | 2 | |
| × | 3 | ||||
| 6 |
Multiply the ones digit (3) of the multiplicator by the number in the tens place value:
3×9=27
Write 7 in the tens place.
Because the result is greater than 9, carry the 2 to the hundreds place.
| Place value | ten thousands | thousands | hundreds | tens | ones |
| 2 | |||||
| 1 | 0 | 3 | 9 | 2 | |
| × | 3 | ||||
| 7 | 6 |
Multiply the ones digit (3) of the multiplicator by the number in the hundreds place value and add the carried number (2):
3×3+2=11
Write 1 in the hundreds place.
Because the result is greater than 9, carry the 1 to the thousands place.
| Place value | ten thousands | thousands | hundreds | tens | ones |
| 1 | 2 | ||||
| 1 | 0 | 3 | 9 | 2 | |
| × | 3 | ||||
| 1 | 7 | 6 |
Multiply the ones digit (3) of the multiplicator by the number in the thousands place value and add the carried number (1):
3×0+1=1
Write 1 in the thousands place.
| Place value | ten thousands | thousands | hundreds | tens | ones |
| 1 | 2 | ||||
| 1 | 0 | 3 | 9 | 2 | |
| × | 3 | ||||
| 1 | 1 | 7 | 6 |
Multiply the ones digit (3) of the multiplicator by the number in the ten thousands place value:
3×1=3
Write 3 in the ten thousands place.
| Place value | ten thousands | thousands | hundreds | tens | ones |
| 1 | 2 | ||||
| 1 | 0 | 3 | 9 | 2 | |
| × | 3 | ||||
| 3 | 1 | 1 | 7 | 6 |
Because we have 3 digit(s) to the right of the decimal point in the numbers that are being multiplied, we move the decimal point 3 time(s) to the left (reducing the result by the factor of 1,000) to get the final result:
The solution is: 31.176
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