Prime factorisation practice

Four fixed Foundation questions, with space for factor trees and matching worked answers.

Prime factorisation

sapora·Answer key
NameDateScore ____ / 4

Split off the smallest prime factor first, then repeat with the remaining number until every end number is prime. Write the product, using powers for repeated factors.

Example: 100 = 2 × 50; 50 = 2 × 25; 25 = 5 × 5. So 100 = 2² × 5².

Factor trees