Respuesta :

Yes 2*5= 10

10 + 10 since its 4 = 20

Answer:

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

Step-by-step 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:

[tex]4\times 5\\= (2\times 2)\times 5\\\text{By associative property of multiplication}\\= 2\times (2\times 5)\\= 2\times 10\\=20\\=4\times 5[/tex]

Hence, Rob can do the multiplication in this way.