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# how does 100 - 1.2 equal to 98.8?

### 5 Answers

- Nino_opsLv 61 decade agoFavorite Answer
100 - (1.2)

= 100 - (1 + 0.2)

= 100 -1 - 0.2

= 99 - 0.2

= 99.0 - 0.2

= 990/10 - 2/10

= 988/10

= 98.8

- 1 decade ago
100 - 1.2 is equal to 98.8 because when you subtract it , it has to be

100.0

- 1.2 since the 2 is bigger then the 0 you have to borrow from 100 after that all you do is subtract and you get 100 . also if you add 98.8 and 1.2 you get 100

- 1 decade ago
First, add a decimal and a zero to the 100:

...100.0

- ..98.8

_______

Now, you have to borrow....you'll borrow from the 1 all the way in the left column...that one will become zero, and then you'll have 9, 9, and 10 in the remaining 3 columns:

...099.(10)

- ..98.8

_________

Now, you subtract like normal, from right to left...10 - 8 = 2, then the decimal, then 9 -8 = 1. The first column 9 -9 = 0 can be left off because the zero is a leading zero.

So, what's left is 1.2.

I hope that helped!

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