Keystones — Lintel
Five GCSE retrieval questions · 18 August 2019 · 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 + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 50°. Find opposite
Answer: 14.3cm -
4. Ratio Mixed ratio problems
£240.00 is shared between A and B in the ratio 5:3. How much does A receive?
Answer: £150.00 -
5. Statistics Mean
The mean of 5 numbers is 27. If 4 of them are 39, 30, 21, 43, what is the missing number?
Answer: 2