Solution - Long multiplication
Step-by-step explanation
1. Rewrite the numbers from top to bottom aligned to the right
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths | ten thousandths |
| 4 | 0 | 5 | ||||||
| × | 0 | . | 9 | 0 | 2 | 5 | ||
| . |
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 4 decimal place(s). So once calculated, the result will be reduced by the factor of 10,000.
| Place value | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 4 | 0 | 5 | |||||
| × | 9 | 0 | 2 | 5 | |||
2. Multiply the numbers using long multiplication method
Start by multiplying the ones digit (5) of the multiplier 9,025 by each digit of the multiplicand 405, from right to left.
Multiply the ones digit (5) of the multiplicator by the number in the ones place value:
5×5=25
Write 5 in the ones place.
Because the result is greater than 9, carry the 2 to the tens place.
| Place value | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 2 | |||||||
| 4 | 0 | 5 | |||||
| × | 9 | 0 | 2 | 5 | |||
| 5 | |||||||
Multiply the ones digit (5) of the multiplicator by the number in the tens place value and add the carried number (2):
5×0+2=2
Write 2 in the tens place.
| Place value | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 2 | |||||||
| 4 | 0 | 5 | |||||
| × | 9 | 0 | 2 | 5 | |||
| 2 | 5 | ||||||
Multiply the ones digit (5) of the multiplicator by the number in the hundreds place value:
5×4=20
Write 0 in the hundreds place.
Because the result is greater than 9, carry the 2 to the thousands place.
| Place value | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 2 | 2 | ||||||
| 4 | 0 | 5 | |||||
| × | 9 | 0 | 2 | 5 | |||
| 2 | 0 | 2 | 5 | ||||
2,025 is the first partial product.
Proceed by multiplying the tens digit (2) of the multiplier (9,025) by each digit of the multiplicand (405), from right to left.
Because digit (2) is in tens place, we shift partial result by 1 place(s) by placing 1 zero(s).
| Place value | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 4 | 0 | 5 | |||||
| × | 9 | 0 | 2 | 5 | |||
| 2 | 0 | 2 | 5 | ||||
| 0 | |||||||
Multiply the tens digit (2) of the multiplicator by the number in the ones place value:
2×5=10
Write 0 in the tens place.
Because the result is greater than 9, carry the 1 to the hundreds place.
| Place value | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 1 | |||||||
| 4 | 0 | 5 | |||||
| × | 9 | 0 | 2 | 5 | |||
| 2 | 0 | 2 | 5 | ||||
| 0 | 0 | ||||||
Multiply the tens digit (2) of the multiplicator by the number in the tens place value and add the carried number (1):
2×0+1=1
Write 1 in the hundreds place.
| Place value | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 1 | |||||||
| 4 | 0 | 5 | |||||
| × | 9 | 0 | 2 | 5 | |||
| 2 | 0 | 2 | 5 | ||||
| 1 | 0 | 0 | |||||
Multiply the tens digit (2) of the multiplicator by the number in the hundreds place value:
2×4=8
Write 8 in the thousands place.
| Place value | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 1 | |||||||
| 4 | 0 | 5 | |||||
| × | 9 | 0 | 2 | 5 | |||
| 2 | 0 | 2 | 5 | ||||
| 8 | 1 | 0 | 0 | ||||
8,100 is the second partial product.
Because the hundreds digit of the multiplicator equals 0, skip to the next digit.
Proceed by multiplying the thousands digit (9) of the multiplier (9,025) by each digit of the multiplicand (405), from right to left.
Because digit (9) is in thousands place, we shift partial result by 3 place(s) by placing 3 zero(s).
| Place value | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 4 | 0 | 5 | |||||
| × | 9 | 0 | 2 | 5 | |||
| 2 | 0 | 2 | 5 | ||||
| 8 | 1 | 0 | 0 | ||||
| 0 | 0 | 0 |
Multiply the thousands digit (9) of the multiplicator by the number in the ones place value:
9×5=45
Write 5 in the thousands place.
Because the result is greater than 9, carry the 4 to the ten thousands place.
| Place value | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 4 | |||||||
| 4 | 0 | 5 | |||||
| × | 9 | 0 | 2 | 5 | |||
| 2 | 0 | 2 | 5 | ||||
| 8 | 1 | 0 | 0 | ||||
| 5 | 0 | 0 | 0 |
Multiply the thousands digit (9) of the multiplicator by the number in the tens place value and add the carried number (4):
9×0+4=4
Write 4 in the ten thousands place.
| Place value | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 4 | |||||||
| 4 | 0 | 5 | |||||
| × | 9 | 0 | 2 | 5 | |||
| 2 | 0 | 2 | 5 | ||||
| 8 | 1 | 0 | 0 | ||||
| 4 | 5 | 0 | 0 | 0 |
Multiply the thousands digit (9) of the multiplicator by the number in the hundreds place value:
9×4=36
Write 6 in the hundred thousands place.
Because the result is greater than 9, carry the 3 to the millions place.
| Place value | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 3 | 4 | ||||||
| 4 | 0 | 5 | |||||
| × | 9 | 0 | 2 | 5 | |||
| 2 | 0 | 2 | 5 | ||||
| 8 | 1 | 0 | 0 | ||||
| 3 | 6 | 4 | 5 | 0 | 0 | 0 |
3,645,000 is the third partial product.
3. Add the partial products
2025+8100+3645000=3655125 long addition steps can be seen here
| Place value | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 4 | 0 | 5 | |||||
| × | 9 | 0 | 2 | 5 | |||
| 2 | 0 | 2 | 5 | ||||
| 8 | 1 | 0 | 0 | ||||
| + | 3 | 6 | 4 | 5 | 0 | 0 | 0 |
| 3 | 6 | 5 | 5 | 1 | 2 | 5 |
Because we have 4 digit(s) to the right of the decimal point in the numbers that are being multiplied, we move the decimal point 4 time(s) to the left (reducing the result by the factor of 10,000) to get the final result:
The solution is: 365.5125
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