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 | millionths | ten millionths |
| Carry | |||||||||
| 0 | . | 0 | 0 | 0 | 0 | 2 | |||
| + | 0 | . | 0 | 0 | 0 | 0 | 0 | 1 | 8 |
| . |
Put zeros in the blank number places:
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths | millionths | ten millionths |
| Carry | |||||||||
| 0 | . | 0 | 0 | 0 | 0 | 2 | 0 | 0 | |
| + | 0 | . | 0 | 0 | 0 | 0 | 0 | 1 | 8 |
| . |
2. Add up the digits in each column, from right to left
Add the numbers in the ten millionths place value.
0+8=8
Write 8 in the ten millionths place.
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths | millionths | ten millionths |
| Carry | |||||||||
| 0 | . | 0 | 0 | 0 | 0 | 2 | 0 | 0 | |
| + | 0 | . | 0 | 0 | 0 | 0 | 0 | 1 | 8 |
| . | 8 |
Add the numbers in the millionths place value.
0+1=1
Write 1 in the millionths place.
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths | millionths | ten millionths |
| Carry | |||||||||
| 0 | . | 0 | 0 | 0 | 0 | 2 | 0 | 0 | |
| + | 0 | . | 0 | 0 | 0 | 0 | 0 | 1 | 8 |
| . | 1 | 8 |
Add the numbers in the hundred thousandths place value.
2+0=2
Write 2 in the hundred thousandths place.
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths | millionths | ten millionths |
| Carry | |||||||||
| 0 | . | 0 | 0 | 0 | 0 | 2 | 0 | 0 | |
| + | 0 | . | 0 | 0 | 0 | 0 | 0 | 1 | 8 |
| . | 2 | 1 | 8 |
Add the numbers in the ten thousandths place value.
0+0=0
Write 0 in the ten thousandths place.
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths | millionths | ten millionths |
| Carry | |||||||||
| 0 | . | 0 | 0 | 0 | 0 | 2 | 0 | 0 | |
| + | 0 | . | 0 | 0 | 0 | 0 | 0 | 1 | 8 |
| . | 0 | 2 | 1 | 8 |
Add the numbers in the thousandths place value.
0+0=0
Write 0 in the thousandths place.
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths | millionths | ten millionths |
| Carry | |||||||||
| 0 | . | 0 | 0 | 0 | 0 | 2 | 0 | 0 | |
| + | 0 | . | 0 | 0 | 0 | 0 | 0 | 1 | 8 |
| . | 0 | 0 | 2 | 1 | 8 |
Add the numbers in the hundredths place value.
0+0=0
Write 0 in the hundredths place.
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths | millionths | ten millionths |
| Carry | |||||||||
| 0 | . | 0 | 0 | 0 | 0 | 2 | 0 | 0 | |
| + | 0 | . | 0 | 0 | 0 | 0 | 0 | 1 | 8 |
| . | 0 | 0 | 0 | 2 | 1 | 8 |
Add the numbers in the tenths place value.
0+0=0
Write 0 in the tenths place.
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths | millionths | ten millionths |
| Carry | |||||||||
| 0 | . | 0 | 0 | 0 | 0 | 2 | 0 | 0 | |
| + | 0 | . | 0 | 0 | 0 | 0 | 0 | 1 | 8 |
| . | 0 | 0 | 0 | 0 | 2 | 1 | 8 |
Add the numbers in the ones place value.
0+0=0
Write 0 in the ones place.
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths | millionths | ten millionths |
| Carry | |||||||||
| 0 | . | 0 | 0 | 0 | 0 | 2 | 0 | 0 | |
| + | 0 | . | 0 | 0 | 0 | 0 | 0 | 1 | 8 |
| 0 | . | 0 | 0 | 0 | 0 | 2 | 1 | 8 |
The solution is: 0.0000218
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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.