Keystones — Lintel
Five GCSE retrieval questions · 22 October 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 6,500,000 in standard form
Answer: 6.5 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 48
Answer: (x + 12)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 42°. Find opposite. Give your answer to 2 decimal places
Answer: 21.61cm -
4. Ratio Mixed ratio problems
Red, blue and green counters are in the ratio 7:4:7. What fraction of the counters are red?
Answer: 7⁄18 -
5. Statistics Mean
The mean of 4 numbers is 28. If 3 of them are 35, 34, 30, what is the missing number?
Answer: 13