คำตอบ - Long addition
คำอธิบายทีละขั้นตอน
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| Carry | |||||||
| 1 | 0 | 2 | . | 9 | |||
| 3 | 2 | 5 | . | 4 | 9 | 7 | |
| + | 2 | 2 | 8 | . | 8 | 7 | |
| . |
Put zeros in the blank number places:
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| Carry | |||||||
| 1 | 0 | 2 | . | 9 | 0 | 0 | |
| 3 | 2 | 5 | . | 4 | 9 | 7 | |
| + | 2 | 2 | 8 | . | 8 | 7 | 0 |
| . |
2. Add up the digits in each column, from right to left
Add the numbers in the thousandths place value.
0+7+0=7
Write 7 in the thousandths place.
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| Carry | |||||||
| 1 | 0 | 2 | . | 9 | 0 | 0 | |
| 3 | 2 | 5 | . | 4 | 9 | 7 | |
| + | 2 | 2 | 8 | . | 8 | 7 | 0 |
| . | 7 |
Add the numbers in the hundredths place value.
0+9+7=16
Write 6 in the hundredths place.
Because the sum is greater than 9, carry the 1 to the tenths place.
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| Carry | 1 | ||||||
| 1 | 0 | 2 | . | 9 | 0 | 0 | |
| 3 | 2 | 5 | . | 4 | 9 | 7 | |
| + | 2 | 2 | 8 | . | 8 | 7 | 0 |
| . | 6 | 7 |
Add the numbers in the tenths place value.
1+9+4+8=22
Write 2 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 | 1 | |||||
| 1 | 0 | 2 | . | 9 | 0 | 0 | |
| 3 | 2 | 5 | . | 4 | 9 | 7 | |
| + | 2 | 2 | 8 | . | 8 | 7 | 0 |
| . | 2 | 6 | 7 |
Add the numbers in the ones place value.
2+2+5+8=17
Write 7 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 | 1 | ||||
| 1 | 0 | 2 | . | 9 | 0 | 0 | |
| 3 | 2 | 5 | . | 4 | 9 | 7 | |
| + | 2 | 2 | 8 | . | 8 | 7 | 0 |
| 7 | . | 2 | 6 | 7 |
Add the numbers in the tens place value.
1+0+2+2=5
Write 5 in the tens place.
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| Carry | 1 | 2 | 1 | ||||
| 1 | 0 | 2 | . | 9 | 0 | 0 | |
| 3 | 2 | 5 | . | 4 | 9 | 7 | |
| + | 2 | 2 | 8 | . | 8 | 7 | 0 |
| 5 | 7 | . | 2 | 6 | 7 |
Add the numbers in the hundreds place value.
1+3+2=6
Write 6 in the hundreds place.
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| Carry | 1 | 2 | 1 | ||||
| 1 | 0 | 2 | . | 9 | 0 | 0 | |
| 3 | 2 | 5 | . | 4 | 9 | 7 | |
| + | 2 | 2 | 8 | . | 8 | 7 | 0 |
| 6 | 5 | 7 | . | 2 | 6 | 7 |
The solution is: 657.267
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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.