Question

Carry out the following multiplication in the easier way, using the properties.

(4) 3109 × 5 × 20

Answer 1

5 × 20 = 100
So, it is easy to carry out the multiplication of 5 and 20.
Therefore, the multiplication of 5 and 20 is done first.
= 3109 × (5 × 20)
= 3109 × 100
= 31900