Keystones — Lintel
Five GCSE retrieval questions · 15 March 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.097
Answer: 9.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 30°. Find adjacent side
Answer: 33.8cm -
4. Ratio Mixed ratio problems
Divide 108 in the ratio 1:3:2
Answer: 18, 54 and 36 -
5. Statistics Mean
The mean of 4 numbers is 27. If 3 of them are 25, 17, 22, what is the missing number?
Answer: 44