Keystones — Lintel
Five GCSE retrieval questions · 9 February 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 97,000,000 in standard form
Answer: 9.7 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 63
Answer: (x + 9)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 40°. Find adjacent side. Give your answer to 2 decimal places
Answer: 23.75cm -
4. Ratio Mixed ratio problems
Orange and purple counters are in the ratio 3:6. What fraction of the counters are orange?
Answer: 1⁄3 -
5. Statistics Mean
The mean of 5 numbers is 37. If 4 of them are 35, 43, 37, 29, what is the missing number?
Answer: 41