Question

Multiply.

Express the product in simplest form.

210·20=n

40

4

1100

20

Answer 1

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