81/90 - 40/90 = 41/90
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1/4 * 30600 = 30600/4 = 76501/5* 30600 =30600/5 = 61201/10* 30600 =30600/10 = 30601/9* 30600 =30600/9 = 3400
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
9/10
Oh, what a happy little math problem we have here! To simplify this, we first subtract 5 from 4 to get -1, and then subtract 10 from 2 to get -8. So, the simplified answer is -1 - 8, which equals -9. Just remember, there are no mistakes in math, only happy little accidents!
If the base is the same, you can subtract the exponents. For example (using "^" por powers):10^5 / 10^2 = 10^310^5 / 10^(-4) = 10^9