Asked by btssss

how do you know that the sum 2/21 plus 3/31 is rational
Answered by oobleck
because the rationals form a group under addition.

Or, just do the addition, and note that the result is also a rational number.
Answered by BabyJesus
u can find weather its rational by determining the denominator and dividing it by the second : )
Answered by Bethzy
3/31 is a rational
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