Keystones — Lintel
Five GCSE retrieval questions · 14 July 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00036
Answer: 3.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 18
Answer: (x + 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 51°. Find adjacent side
Answer: 17.6cm -
4. Ratio Mixed ratio problems
£216.00 is shared between A and B in the ratio 5:3. How much does A receive?
Answer: £135.00 -
5. Statistics Mean
The mean of 6 numbers is 39. If 5 of them are 48, 20, 20, 28, 47, what is the missing number?
Answer: 71