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 | hundred thousandths |
| Carry | |||||||
| 0 | . | 4 | 9 | 8 | |||
| + | 0 | . | 9 | 6 | 0 | 2 | 5 |
| . |
Put zeros in the blank number places:
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths |
| Carry | |||||||
| 0 | . | 4 | 9 | 8 | 0 | 0 | |
| + | 0 | . | 9 | 6 | 0 | 2 | 5 |
| . |
2. Add up the digits in each column, from right to left
Add the numbers in the hundred thousandths place value.
0+5=5
Write 5 in the hundred thousandths place.
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths |
| Carry | |||||||
| 0 | . | 4 | 9 | 8 | 0 | 0 | |
| + | 0 | . | 9 | 6 | 0 | 2 | 5 |
| . | 5 |
Add the numbers in the ten thousandths place value.
0+2=2
Write 2 in the ten thousandths place.
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths |
| Carry | |||||||
| 0 | . | 4 | 9 | 8 | 0 | 0 | |
| + | 0 | . | 9 | 6 | 0 | 2 | 5 |
| . | 2 | 5 |
Add the numbers in the thousandths place value.
8+0=8
Write 8 in the thousandths place.
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths |
| Carry | |||||||
| 0 | . | 4 | 9 | 8 | 0 | 0 | |
| + | 0 | . | 9 | 6 | 0 | 2 | 5 |
| . | 8 | 2 | 5 |
Add the numbers in the hundredths place value.
9+6=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 | hundred thousandths |
| Carry | 1 | ||||||
| 0 | . | 4 | 9 | 8 | 0 | 0 | |
| + | 0 | . | 9 | 6 | 0 | 2 | 5 |
| . | 5 | 8 | 2 | 5 |
Add the numbers in the tenths place value.
1+4+9=14
Write 4 in the tenths place.
Because the sum is greater than 9, carry the 1 to the ones place.
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths |
| Carry | 1 | 1 | |||||
| 0 | . | 4 | 9 | 8 | 0 | 0 | |
| + | 0 | . | 9 | 6 | 0 | 2 | 5 |
| . | 4 | 5 | 8 | 2 | 5 |
Add the numbers in the ones place value.
1+0+0=1
Write 1 in the ones place.
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths |
| Carry | 1 | 1 | |||||
| 0 | . | 4 | 9 | 8 | 0 | 0 | |
| + | 0 | . | 9 | 6 | 0 | 2 | 5 |
| 1 | . | 4 | 5 | 8 | 2 | 5 |
The solution is: 1.45825
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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.