Keystones — Lintel
Five GCSE retrieval questions · 16 March 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
230000
Answer: 2.3 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 8
Answer: (x + 8)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 40°. Find opposite
Answer: 20.cm -
4. Ratio Mixed ratio problems
Divide 120 in the ratio 1:2:3
Answer: 20, 40 and 60 -
5. Statistics Mean
The mean of 5 numbers is 21. If 4 of them are 33, 38, 21, 39, what is the missing number?
Answer: -26