คำตอบ - Long addition
คำอธิบายทีละขั้นตอน
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths |
| TABLE_NAME_CARRY | ||||
| 7 | 8 | . | 5 | |
| 3 | . | 2 | ||
| + | 8 | . | 8 | |
| . |
2. Add up the digits in each column, from right to left
Add the numbers in the tenths place value.
5+2+8=15
Write 5 in the tenths place.
Because the sum is greater than 9, carry the 1 to the ones place.
| Place value | tens | ones | . | tenths |
| TABLE_NAME_CARRY | 1 | |||
| 7 | 8 | . | 5 | |
| 3 | . | 2 | ||
| + | 8 | . | 8 | |
| . | 5 |
Add the numbers in the ones place value.
1+8+3+8=20
Write 0 in the ones place.
Because the sum is greater than 9, carry the 2 to the tens place.
| Place value | tens | ones | . | tenths |
| TABLE_NAME_CARRY | 2 | 1 | ||
| 7 | 8 | . | 5 | |
| 3 | . | 2 | ||
| + | 8 | . | 8 | |
| 0 | . | 5 |
Add the numbers in the tens place value.
2+7=9
Write 9 in the tens place.
| Place value | tens | ones | . | tenths |
| TABLE_NAME_CARRY | 2 | 1 | ||
| 7 | 8 | . | 5 | |
| 3 | . | 2 | ||
| + | 8 | . | 8 | |
| 9 | 0 | . | 5 |
The solution is: 90.5
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Learn more with Tiger
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.