Answer:
40
Step-by-step explanation
5x8=40
8x5=40
40 is the first number 8 and 5 can both multiply too, so that would be how you get your answer.
Explanation:
The common denominator is found by multiplying the denominators8*5 = 40
3/8 * 5/5 = 15/40
4/5*8/8 =32/40
The common denominator is 40
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