Keystones — Lintel
Five GCSE retrieval questions · 23 December 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000074 in standard form
Answer: 7.4 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x + 12
Answer: (x + 4)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 58°. Find adjacent side. Give your answer to 2 decimal places
Answer: 11.13cm -
4. Ratio Mixed ratio problems
Red and blue counters are in the ratio 9:15. What fraction of the counters are blue?
Answer: 5⁄8 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 24, 18, 49, what is the missing number?
Answer: 45