Keystones — Lintel
Five GCSE retrieval questions · 5 March 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.038 in standard form
Answer: 3.8 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 6
Answer: (x + 6)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 51°. Find adjacent side. Give your answer to 2 decimal places
Answer: 19.51cm -
4. Ratio Mixed ratio problems
Black, white and yellow beads are in the ratio 6:11:10. What fraction of the beads are white?
Answer: 11⁄27 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 28, 16, 24, what is the missing number?
Answer: 52