Keystones — Lintel
Five GCSE retrieval questions · 7 June 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.048 in standard form
Answer: 4.8 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 8
Answer: (x + 8)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 54°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.52cm -
4. Ratio Mixed ratio problems
Black, white and yellow sweets are in the ratio 5:9:8. What fraction of the sweets are yellow?
Answer: 4⁄11 -
5. Statistics Mean
The mean of 5 numbers is 30. If 4 of them are 30, 20, 31, 37, what is the missing number?
Answer: 32