Keystones — Lintel
Five GCSE retrieval questions · 5 November 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.039 in standard form
Answer: 3.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 16
Answer: (x + 8)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 51°. Find opposite. Give your answer to 2 decimal places
Answer: 32.11cm -
4. Ratio Mixed ratio problems
Black, white and yellow sweets are in the ratio 3:5:8. What fraction of the sweets are black?
Answer: 3⁄16 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 16, 34, 42, 35, what is the missing number?
Answer: 18