how does 100 - 1.2 equal to 98.8?

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  • 1 decade ago
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    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

    It does because 98.8 + 1.2 = 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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  • 1 decade ago

    100-1=99

    99-0.2=98.8

    100-1.2=98.8

    Source(s): 1st grade math
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