Keystones — Lintel
Five GCSE retrieval questions · 10 November 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0042
Answer: 4.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 28
Answer: (x + 7)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 40°. Find opposite
Answer: 15.9cm -
4. Ratio Mixed ratio problems
Divide 143 in the ratio 4:4:3
Answer: 52, 52 and 39 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 46, 30, 15, what is the missing number?
Answer: 65