คำตอบ - Long addition
7.8
คำอธิบายทีละขั้นตอน
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | ones | . | tenths |
| Carry | |||
| 5 | . | 5 | |
| + | 2 | . | 3 |
| . |
2. Add up the digits in each column, from right to left
Add the numbers in the tenths place value.
5+3=8
Write 8 in the tenths place.
| Place value | ones | . | tenths |
| Carry | |||
| 5 | . | 5 | |
| + | 2 | . | 3 |
| . | 8 |
Add the numbers in the ones place value.
5+2=7
Write 7 in the ones place.
| Place value | ones | . | tenths |
| Carry | |||
| 5 | . | 5 | |
| + | 2 | . | 3 |
| 7 | . | 8 |
The solution is: 7.8
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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.