Keystones — Lintel
Five GCSE retrieval questions · 4 August 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 79,000 in standard form
Answer: 7.9 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 10x + 21
Answer: (x + 7)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 60°. Find opposite. Give your answer to 2 decimal places
Answer: 50.23cm -
4. Ratio Mixed ratio problems
Simplify: 10:4:6
Answer: 5:2:3 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 49, 45, 44, what is the missing number?
Answer: 6