Keystones — Lintel
Five GCSE retrieval questions · 26 April 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00028
Answer: 2.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 53°. Find opposite
Answer: 38.5cm -
4. Ratio Mixed ratio problems
£272.00 is shared between A and B in the ratio 3:5. How much does A receive?
Answer: £102.00 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 41, 50, 46, 31, 21, what is the missing number?
Answer: -9