Keystones — Lintel
Five GCSE retrieval questions · 28 March 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
920000
Answer: 9.2 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 45°. Find opposite
Answer: 18cm -
4. Ratio Mixed ratio problems
Divide 84 in the ratio 1:4:1
Answer: 14, 56 and 14 -
5. Statistics Mean
The mean of 6 numbers is 38. If 5 of them are 20, 15, 27, 34, 21, what is the missing number?
Answer: 111