4. Subtraction of decimals
On the left picture, we have 2 units or 20 decimals and we subtract 8 decimals or 0.8 units. Finally on the right picture, we have 12 decimals or 1.2 units.
2 - 0,8 = 1,2
When we subtract decimals numbers, we must take into account:
Line up the subtrahend (the smaller number) with the minuend (the greater number) vertically so that the decimal points and units all lie on a vertical line.
If the minuend and the subtrahend do not have the same number of digits, we have to add extra zeros to the right of the number so that each number has the same number of digits to the right of the decimal place.
Subtract the numbers as you would whole numbers.
Place the decimal point of the result in line with the other decimal points.
- 1,25 -> 1,25
1,75 -> 1,75
Remember that the minuend = subtrahend + difference (or result) and check that the subtraction is correct.
Are these decimal numbers in the correct position for the subtraction?