คำตอบ - Long addition
256
คำอธิบายทีละขั้นตอน
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundreds | tens | ones |
| Carry | |||
| 1 | 0 | 9 | |
| 1 | 2 | 9 | |
| + | 1 | 8 | |
2. Add up the digits in each column, from right to left
Add the numbers in the ones place value.
9+9+8=26
Write 6 in the ones place.
Because the sum is greater than 9, carry the 2 to the tens place.
| Place value | hundreds | tens | ones |
| Carry | 2 | ||
| 1 | 0 | 9 | |
| 1 | 2 | 9 | |
| + | 1 | 8 | |
| 6 |
Add the numbers in the tens place value.
2+0+2+1=5
Write 5 in the tens place.
| Place value | hundreds | tens | ones |
| Carry | 2 | ||
| 1 | 0 | 9 | |
| 1 | 2 | 9 | |
| + | 1 | 8 | |
| 5 | 6 |
Add the numbers in the hundreds place value.
1+1=2
Write 2 in the hundreds place.
| Place value | hundreds | tens | ones |
| Carry | 2 | ||
| 1 | 0 | 9 | |
| 1 | 2 | 9 | |
| + | 1 | 8 | |
| 2 | 5 | 6 |
The solution is: 256
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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.