Question

Describe the error in the work shown below.

Find an expression equivalent to 18 + 30.
Factors of 18: 1, 2, 3, 6, 9, 18
Factors of 30:1,2,3,5,6, 10, 15, 30
18 + 30 = 6(3 + 10)​

Answer 1

the bottom equation should be 18+30=3(6+10)

Explanation:

6(3+10) = 18+60 which equals 78

78 does not equal 18