Keystones — Lintel
Five GCSE retrieval questions · 2 April 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.063 in standard form
Answer: 6.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 32
Answer: (x + 8)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 47°. Find opposite. Give your answer to 2 decimal places
Answer: 32.17cm -
4. Ratio Mixed ratio problems
Divide 115 in the ratio 2:1:2
Answer: 46, 23 and 46 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 19, 50, 26, 35, what is the missing number?
Answer: 50