Question

Which expression is NOT equivalent to 60+20

A 10(6+2)
b 5(12+4)
c2(30+10)
d 10(6+1)

Answer 1

Let’s start by defining 60 + 20:

60 + 20 = 80

Now, let’s see what equation doesn’t match 80:

10(6 + 2) = 60 + 20 = 80

A is incorrect; it matches 80.

5(12 + 4) = 60 + 20 = 80

B is incorrect; it matches 80.

2(30 + 10) = 60 + 20 = 80

C is incorrect; it matches 80.

That leaves D, but let’s solve it to prove:

10(6 + 1) = 60 + 10 = 70

D is correct; 70 will never be equivalent to 80.

The expression 10(6 + 1) is not equivalent to 60 + 20.