Keystones — Lintel
Five GCSE retrieval questions · 7 May 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00081
Answer: 8.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 32
Answer: (x + 8)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 36°. Find opposite
Answer: 14.5cm -
4. Ratio Mixed ratio problems
£126.00 is shared between A and B in the ratio 1:2. How much does A receive?
Answer: £42.00 -
5. Statistics Mean
The mean of 6 numbers is 26. If 5 of them are 22, 33, 37, 41, 31, what is the missing number?
Answer: -8