9/10 - 2/5 =
In order to add or subtract fractions, they must have the same denominator.
9/10 - (2/2)(2/5) =
9/10 - 4/10 =
5/10 =
1/2
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2/5 x 2/2 = 4/10 1/2 x 5/5 = 5/10 4/10 + 5/10 = 9/10 9 tenths
4.5/5 = 9/10
9/10 - 2/5 = 9/10 = 4/10 = 5/10 or, in simplest terms, 1/2.
9/10
(1 / 2) + (2 / 5) = 0.9 or 9 / 10