คำตอบ - Long addition
คำอธิบายทีละขั้นตอน
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| TABLE_NAME_CARRY | ||||||
| 6 | 5 | . | 9 | |||
| + | 7 | . | 2 | 4 | 9 | |
| . |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| TABLE_NAME_CARRY | ||||||
| 6 | 5 | . | 9 | 0 | 0 | |
| + | 7 | . | 2 | 4 | 9 | |
| . |
2. Add up the digits in each column, from right to left
Add the numbers in the thousandths place value.
0+9=9
Write 9 in the thousandths place.
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| TABLE_NAME_CARRY | ||||||
| 6 | 5 | . | 9 | 0 | 0 | |
| + | 7 | . | 2 | 4 | 9 | |
| . | 9 |
Add the numbers in the hundredths place value.
0+4=4
Write 4 in the hundredths place.
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| TABLE_NAME_CARRY | ||||||
| 6 | 5 | . | 9 | 0 | 0 | |
| + | 7 | . | 2 | 4 | 9 | |
| . | 4 | 9 |
Add the numbers in the tenths place value.
9+2=11
Write 1 in the tenths place.
Because the sum is greater than 9, carry the 1 to the ones place.
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| TABLE_NAME_CARRY | 1 | |||||
| 6 | 5 | . | 9 | 0 | 0 | |
| + | 7 | . | 2 | 4 | 9 | |
| . | 1 | 4 | 9 |
Add the numbers in the ones place value.
1+5+7=13
Write 3 in the ones place.
Because the sum is greater than 9, carry the 1 to the tens place.
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| TABLE_NAME_CARRY | 1 | 1 | ||||
| 6 | 5 | . | 9 | 0 | 0 | |
| + | 7 | . | 2 | 4 | 9 | |
| 3 | . | 1 | 4 | 9 |
Add the numbers in the tens place value.
1+6=7
Write 7 in the tens place.
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| TABLE_NAME_CARRY | 1 | 1 | ||||
| 6 | 5 | . | 9 | 0 | 0 | |
| + | 7 | . | 2 | 4 | 9 | |
| 7 | 3 | . | 1 | 4 | 9 |
The solution is: 73.149
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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.