Multiply.

Express the product in simplest form.

210·20=n

40

4

1100

20

The number which has to be put in simplest form:

n = 210 * 20=4200

Factorizing 210 and 20 in terms of prime factors,

210 = 2 * 3 * 5 * 7

20 = 2 * 2 * 5

210 * 20=4200

= 2 * 3 * 5*7*2*2*5

= 2*2*2*3*5*5*7