Back to Prime Factorisation — Problem 2 · Task Set 12

Exercises: Prime Factorisation

Work through each section in order. Write every prime factorisation as a product of primes, using index (exponent) notation where a prime repeats. Verify larger factorisations by multiplying the primes back to the original number.

Grade 7·16 problems·~28 min·Uganda NCDC Primary 7 Mathematics·lesson·operations-04
Work through problems with immediate feedback
A

Fluency Practice

Factor tree for 90 branching into 9 and 10, then into prime leaves 3, 3, 2, and 5
1.

Use the factor tree to find the prime factorisation of 9090. Write your answer as a product of primes using index notation.