Keystones — Lintel
Five GCSE retrieval questions · 10 December 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
12000000
Answer: 1.2 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 10
Answer: (x + 5)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 37°. Find opposite
Answer: 20.3cm -
4. Ratio Mixed ratio problems
Simplify: 6:4:12
Answer: 3:2:6 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 36, 43, 42, 18, 20, what is the missing number?
Answer: 57