คำตอบ - Long addition
คำอธิบายทีละขั้นตอน
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths |
| Carry | ||||||
| 0 | . | 5 | 9 | 6 | 2 | |
| + | 1 | . | 2 | 5 | 9 | 8 |
| . |
2. Add up the digits in each column, from right to left
Add the numbers in the ten thousandths place value.
2+8=10
Write 0 in the ten thousandths place.
Because the sum is greater than 9, carry the 1 to the thousandths place.
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths |
| Carry | 1 | |||||
| 0 | . | 5 | 9 | 6 | 2 | |
| + | 1 | . | 2 | 5 | 9 | 8 |
| . | 0 |
Add the numbers in the thousandths place value.
1+6+9=16
Write 6 in the thousandths place.
Because the sum is greater than 9, carry the 1 to the hundredths place.
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths |
| Carry | 1 | 1 | ||||
| 0 | . | 5 | 9 | 6 | 2 | |
| + | 1 | . | 2 | 5 | 9 | 8 |
| . | 6 | 0 |
Add the numbers in the hundredths place value.
1+9+5=15
Write 5 in the hundredths place.
Because the sum is greater than 9, carry the 1 to the tenths place.
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths |
| Carry | 1 | 1 | 1 | |||
| 0 | . | 5 | 9 | 6 | 2 | |
| + | 1 | . | 2 | 5 | 9 | 8 |
| . | 5 | 6 | 0 |
Add the numbers in the tenths place value.
1+5+2=8
Write 8 in the tenths place.
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths |
| Carry | 1 | 1 | 1 | |||
| 0 | . | 5 | 9 | 6 | 2 | |
| + | 1 | . | 2 | 5 | 9 | 8 |
| . | 8 | 5 | 6 | 0 |
Add the numbers in the ones place value.
0+1=1
Write 1 in the ones place.
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths |
| Carry | 1 | 1 | 1 | |||
| 0 | . | 5 | 9 | 6 | 2 | |
| + | 1 | . | 2 | 5 | 9 | 8 |
| 1 | . | 8 | 5 | 6 | 0 |
The solution is: 1.856
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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.