Keystones — Lintel
Five GCSE retrieval questions · 21 May 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 4,700,000 in standard form
Answer: 4.7 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 18
Answer: (x + 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 52°. Find opposite. Give your answer to 2 decimal places
Answer: 30.72cm -
4. Ratio Mixed ratio problems
Black and white beads are in the ratio 13:15. What fraction of the beads are black?
Answer: 13⁄28 -
5. Statistics Mean
The mean of 4 numbers is 29. If 3 of them are 24, 30, 33, what is the missing number?
Answer: 29