Keystones — Lintel
Five GCSE retrieval questions · 28 October 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
280000
Answer: 2.8 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 42
Answer: (x + 7)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 55°. Find opposite
Answer: 28.6cm -
4. Ratio Mixed ratio problems
£231.00 is shared between A and B in the ratio 4:3. How much does A receive?
Answer: £132.00 -
5. Statistics Mean
The mean of 4 numbers is 38. If 3 of them are 17, 19, 30, what is the missing number?
Answer: 86