Keystones — Lintel
Five GCSE retrieval questions · 14 August 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.098
Answer: 9.8 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 18
Answer: (x + 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 31°. Find opposite
Answer: 16.8cm -
4. Ratio Mixed ratio problems
Simplify: 6:18:15
Answer: 2:6:5 -
5. Statistics Mean
The mean of 4 numbers is 32. If 3 of them are 37, 32, 42, what is the missing number?
Answer: 17