Keystones — Lintel
Five GCSE retrieval questions · 21 December 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.035
Answer: 3.5 × 10^-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 34°. Find opposite
Answer: 13.5cm -
4. Ratio Mixed ratio problems
Simplify: 6:18:6
Answer: 1:3:1 -
5. Statistics Mean
The mean of 6 numbers is 38. If 5 of them are 41, 24, 35, 31, 42, what is the missing number?
Answer: 55