คำตอบ - Long addition
คำอธิบายทีละขั้นตอน
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| Carry | ||||||
| 1 | 7 | . | 7 | 5 | ||
| 8 | 2 | . | 7 | 9 | ||
| + | 4 | 8 | . | 7 | 7 | 8 |
| . |
Put zeros in the blank number places:
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| Carry | |||||||
| 1 | 7 | . | 7 | 5 | 0 | ||
| 8 | 2 | . | 7 | 9 | 0 | ||
| + | 4 | 8 | . | 7 | 7 | 8 | |
| . |
2. Add up the digits in each column, from right to left
Add the numbers in the thousandths place value.
0+0+8=8
Write 8 in the thousandths place.
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| Carry | |||||||
| 1 | 7 | . | 7 | 5 | 0 | ||
| 8 | 2 | . | 7 | 9 | 0 | ||
| + | 4 | 8 | . | 7 | 7 | 8 | |
| . | 8 |
Add the numbers in the hundredths place value.
5+9+7=21
Write 1 in the hundredths place.
Because the sum is greater than 9, carry the 2 to the tenths place.
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| Carry | 2 | ||||||
| 1 | 7 | . | 7 | 5 | 0 | ||
| 8 | 2 | . | 7 | 9 | 0 | ||
| + | 4 | 8 | . | 7 | 7 | 8 | |
| . | 1 | 8 |
Add the numbers in the tenths place value.
2+7+7+7=23
Write 3 in the tenths place.
Because the sum is greater than 9, carry the 2 to the ones place.
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| Carry | 2 | 2 | |||||
| 1 | 7 | . | 7 | 5 | 0 | ||
| 8 | 2 | . | 7 | 9 | 0 | ||
| + | 4 | 8 | . | 7 | 7 | 8 | |
| . | 3 | 1 | 8 |
Add the numbers in the ones place value.
2+7+2+8=19
Write 9 in the ones place.
Because the sum is greater than 9, carry the 1 to the tens place.
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| Carry | 1 | 2 | 2 | ||||
| 1 | 7 | . | 7 | 5 | 0 | ||
| 8 | 2 | . | 7 | 9 | 0 | ||
| + | 4 | 8 | . | 7 | 7 | 8 | |
| 9 | . | 3 | 1 | 8 |
Add the numbers in the tens place value.
1+1+8+4=14
Write 4 in the tens place.
Because the sum is greater than 9, carry the 1 to the hundreds place.
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| Carry | 1 | 1 | 2 | 2 | |||
| 1 | 7 | . | 7 | 5 | 0 | ||
| 8 | 2 | . | 7 | 9 | 0 | ||
| + | 4 | 8 | . | 7 | 7 | 8 | |
| 4 | 9 | . | 3 | 1 | 8 |
Add the numbers in the hundreds place value.
Write 1 in the hundreds place.
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| Carry | 1 | 1 | 2 | 2 | |||
| 1 | 7 | . | 7 | 5 | 0 | ||
| 8 | 2 | . | 7 | 9 | 0 | ||
| + | 4 | 8 | . | 7 | 7 | 8 | |
| 1 | 4 | 9 | . | 3 | 1 | 8 |
The solution is: 149.318
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Addition is the most basic math action and is used daily by almost everybody. Playing games, paying at the supermarket, and cooking are just a few examples of when we add.
Long addition is a clear and simple method to add numbers. Especially big numbers.
Although today calculators do this job for us, understanding the concept of addition is a key ability for understanding math.