Keystones — Lintel
Five GCSE retrieval questions · 4 September 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.057
Answer: 5.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 20
Answer: (x + 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 41°. Find opposite
Answer: 9.6cm -
4. Ratio Mixed ratio problems
Divide 75 in the ratio 2:2:1
Answer: 30, 30 and 15 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 36, 49, 20, what is the missing number?
Answer: 31