คำตอบ - Long subtraction
คำอธิบายทีละขั้นตอน
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 1 | 3 | . | 5 | |||
| - | 1 | 0 | . | 8 | 5 | 6 |
| . |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 1 | 3 | . | 5 | 0 | 0 | |
| - | 1 | 0 | . | 8 | 5 | 6 |
| . |
2. Subtract the numbers using long subtraction method
Because the upper digit (0) in the thousandths column is too small to get a positive difference, borrow 1 from the number to the left (50) which becomes (49) and get (10).
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 4 | 9 | 10 | ||||
| 1 | 3 | . | 5 | 0 | 0 | |
| - | 1 | 0 | . | 8 | 5 | 6 |
| . |
Subtract the numbers in the thousandths column from the top number:
10-0-6=4
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 4 | 9 | 10 | ||||
| 1 | 3 | . | 5 | 0 | 0 | |
| - | 1 | 0 | . | 8 | 5 | 6 |
| . | 4 |
Subtract the numbers in the hundredths column from the top number:
9-5=4
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 4 | 9 | 10 | ||||
| 1 | 3 | . | 5 | 0 | 0 | |
| - | 1 | 0 | . | 8 | 5 | 6 |
| . | 4 | 4 |
Because the upper digit (4) in the tenths column is too small to get a positive difference, borrow 1 from the digit (3) in the next number place which becomes (2) and get (14).
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 2 | 14 | |||||
| 4 | 9 | 10 | ||||
| 1 | 3 | . | 5 | 0 | 0 | |
| - | 1 | 0 | . | 8 | 5 | 6 |
| . | 4 | 4 |
Subtract the numbers in the tenths column from the top number:
14-8=6
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 2 | 14 | |||||
| 4 | 9 | 10 | ||||
| 1 | 3 | . | 5 | 0 | 0 | |
| - | 1 | 0 | . | 8 | 5 | 6 |
| . | 6 | 4 | 4 |
Subtract the numbers in the ones column from the top number:
2-0=2
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 2 | 14 | |||||
| 4 | 9 | 10 | ||||
| 1 | 3 | . | 5 | 0 | 0 | |
| - | 1 | 0 | . | 8 | 5 | 6 |
| 2 | . | 6 | 4 | 4 |
Subtract the numbers in the tens column from the top number:
1-1=0
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 2 | 14 | |||||
| 4 | 9 | 10 | ||||
| 1 | 3 | . | 5 | 0 | 0 | |
| - | 1 | 0 | . | 8 | 5 | 6 |
| 0 | 2 | . | 6 | 4 | 4 |
The solution is: 2.644
ทำไมต้องเรียนสิ่งนี้
Learn more with Tiger
Why learn this