Solution - Long multiplication
Step-by-step explanation
1. Rewrite the numbers from top to bottom aligned to the right
| Place value | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths | millionths | ten millionths | hundred millionths |
| 0 | . | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 5 | |||||||||
| × | 2 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |||||||||
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 8 decimal place(s). So once calculated, the result will be reduced by the factor of 100,000,000.
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 5 | ||||||||||
| × | 2 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
2. Multiply the numbers using long multiplication method
Because the millions digit of the multiplicator equals 0, skip to the next digit.
Proceed by multiplying the ten millions digit (4) of the multiplier (240,000,000) by each digit of the multiplicand (5), from right to left.
Because digit (4) is in ten millions place, we shift partial result by 7 place(s) by placing 7 zero(s).
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 5 | ||||||||||
| × | 2 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||
Multiply the ten millions digit (4) of the multiplicator by the number in the ones place value:
4×5=20
Write 0 in the ten millions place.
Because the result is greater than 9, carry the 2 to the hundred millions place.
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 2 | ||||||||||
| 5 | ||||||||||
| × | 2 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||
200,000,000 is the first partial product.
Proceed by multiplying the hundred millions digit (2) of the multiplier (240,000,000) by each digit of the multiplicand (5), from right to left.
Because digit (2) is in hundred millions place, we shift partial result by 8 place(s) by placing 8 zero(s).
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 5 | ||||||||||
| × | 2 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Multiply the hundred millions digit (2) of the multiplicator by the number in the ones place value:
2×5=10
Write 0 in the hundred millions place.
Because the result is greater than 9, carry the 1 to the billions place.
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 1 | ||||||||||
| 5 | ||||||||||
| × | 2 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||
| 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
1,000,000,000 is the second partial product.
3. Add the partial products
200000000+1000000000=1200000000 long addition steps can be seen here
| Place value | billions | hundred millions | ten millions | millions | hundred thousands | ten thousands | thousands | hundreds | tens | ones |
| 5 | ||||||||||
| × | 2 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||
| + | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Because we have 8 digit(s) to the right of the decimal point in the numbers that are being multiplied, we move the decimal point 8 time(s) to the left (reducing the result by the factor of 100,000,000) to get the final result:
The solution is: 12
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