Keystones — Lintel
Five GCSE retrieval questions · 30 December 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000028 in standard form
Answer: 2.8 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 5
Answer: (x + 1)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 28°. Find adjacent side. Give your answer to 2 decimal places
Answer: 23.84cm -
4. Ratio Mixed ratio problems
Divide 252 in the ratio 3:4:2
Answer: 84, 112 and 56 -
5. Statistics Mean
Calculate the mean of: 26, 27, 5, 6, 31, 17, 31. Give your answer to 2 decimal places
Answer: 20.43