Keystones — Lintel
Five GCSE retrieval questions · 21 December 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00072 in standard form
Answer: 7.2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 24
Answer: (x + 8)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 48°. Find opposite. Give your answer to 2 decimal places
Answer: 33.32cm -
4. Ratio Mixed ratio problems
Orange, purple and pink counters are in the ratio 12:11:12. What fraction of the counters are purple?
Answer: 11⁄35 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 44, 31, 20, 37, what is the missing number?
Answer: 48