Keystones — Lintel
Five GCSE retrieval questions · 18 April 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000027 in standard form
Answer: 2.7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 42
Answer: (x + 7)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 57°. Find opposite. Give your answer to 2 decimal places
Answer: 15.4cm -
4. Ratio Mixed ratio problems
Orange and purple counters are in the ratio 7:6. What fraction of the counters are orange?
Answer: 7⁄13 -
5. Statistics Mean
The mean of 6 numbers is 28. If 5 of them are 18, 29, 25, 20, 37, what is the missing number?
Answer: 39