Question

400 - Find the square root of this number by prime factorisation method.

Answer 1

Solution :

Resolving the given number

400 into prime factors , we get

400 = 2×2×2×2×5×5

= (2×2)×(2×2)×(5×5)

Therefore ,

Square root of 400

= √400

= √(2×2)×(2×2)×(5×5)

= 2 × 2 × 5

= 20

••••

Answer 2

the square root of 400is 20