Xiao's teacher asked him to rewrite the sum 60 + 90 as the product of the gcf of the two numbers a sum. xiao wrote 3(20 + 30). what mistake did xiao make? how should he have written the sum?

The greatest common factor is at least 10. That comes from the two zeros, one on 60 and the other on 90.

10(6 + 9) Now you can take out 3 more 10*3 (2 + 3) = 30 * (2 + 3). There is another more mathematical way to do this. Factor using prime factors.

60 = 2 * 2 *3 * 5

90 = 2 * 3 * 3 * 5

Put all the bolds together. 2 * 3 * 5 These numbers represent the highest common factor.

GCF = 2*3*5 = 30

yeet

step-by-step explanation:

just sum

10 + 10 = 20