Keystones — Lintel
Five GCSE retrieval questions · 10 February 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
9100000
Answer: 9.1 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 16
Answer: (x + 8)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 39°. Find opposite
Answer: 21.9cm -
4. Ratio Mixed ratio problems
£378.00 is shared between A and B in the ratio 5:4. How much does A receive?
Answer: £210.00 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 28, 29, 31, 20, what is the missing number?
Answer: 37