Keystones — Lintel
Five GCSE retrieval questions · 15 March 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00032 in standard form
Answer: 3.2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 9
Answer: (x + 9)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 51°. Find opposite. Give your answer to 2 decimal places
Answer: 29.64cm -
4. Ratio Mixed ratio problems
Simplify: 9:9:18
Answer: 1:1:2 -
5. Statistics Mean
The mean of 5 numbers is 25. If 4 of them are 36, 28, 20, 32, what is the missing number?
Answer: 9