Question

Rob says he can use 2 x 5 to find 4 x 5. is he correct

Answer 1

Yes, Rob can use 2 × 5 for multiplication of 4 × 5.

Explanation:

We are given the following information in the question:

Rob can use 2 × 5 for multiplication of 4 × 5.

It can be used in the following manner:

`4* 5\\= (2* 2)* 5\\\text{By associative property of multiplication}\\= 2* (2* 5)\\= 2* 10\\=20\\=4* 5`

Hence, Rob can do the multiplication in this way.