Keystones — Lintel
Five GCSE retrieval questions · 4 March 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000037 in standard form
Answer: 3.7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 43°. Find opposite. Give your answer to 2 decimal places
Answer: 27.04cm -
4. Ratio Mixed ratio problems
Simplify: 16:8:12
Answer: 4:2:3 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 32, 39, 25, what is the missing number?
Answer: 48