Properties of Numbers: WJEC GCSE Intermediate November 2022 Unit 1 Q16

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Intermediate November 2022 Unit 1 Q16

WJECIntermediateCurrent spec3 marksProperties of Numbers

16. Express 1575 as a product of its prime factors in index form. [3]

Mark scheme

Scheme	Marks	Comments
For a correct method that produces 2 prime factors from the set {3, 3, 5, 5, 7} before the 2^nd error.	M1	Must be a method that involves only division.
3, 3, 5, 5, 7	A1	CAO for sight of the five correct factors (Ignore 1s)
3² × 5² × 7	B1	Do not FT non-primes. FT ‘their primes’ provided at least one index form used with at least a square. Allow (3²)(5²)(7) and 3².5².7 Do not allow 3²,5²,7. Inclusion of 1 as a factor gets B0.