Keystones — Lintel
Five GCSE retrieval questions · 25 April 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
46000
Answer: 4.6 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 34°. Find opposite
Answer: 8.8cm -
4. Ratio Mixed ratio problems
Divide 108 in the ratio 4:3:2
Answer: 48, 36 and 24 -
5. Statistics Mean
The mean of 4 numbers is 25. If 3 of them are 39, 28, 18, what is the missing number?
Answer: 15