Question

3.)

Which of these expressions is NOT equivalent to
21 x 13?
a) (13 x 20) + (13 x 1)
b) (21 x 10) + (213)
c) (30 x 13) - (9 x 13)
d) (20 x 10) + (1 x 3)​

Answer 1

Let’s find out...

Explanation:

21 x 13 = 273

(13 x 20) + (13 x 1) =

260 + 13 = 273

So this one matches

(21 x 10) + 213 =

210 + 213 = 423

Does not match

(30 x 13) - (9 x 13) =

390 - 117 = 273

This one matches

(20 x 10) + (1 x 3) =

200 + 3 = 203

Does not match