Keystones — Lintel
Five GCSE retrieval questions · 10 July 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00085 in standard form
Answer: 8.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 5
Answer: (x + 5)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 26.22cm -
4. Ratio Mixed ratio problems
Orange, purple and pink counters are in the ratio 2:8:12. What fraction of the counters are pink?
Answer: 6⁄11 -
5. Statistics Mean
The mean of 6 numbers is 37. If 5 of them are 36, 49, 39, 19, 44, what is the missing number?
Answer: 35