Keystones — Lintel
Five GCSE retrieval questions · 14 June 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.079
Answer: 7.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 30
Answer: (x - 6)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 50°. Find opposite
Answer: 22.6cm -
4. Ratio Mixed ratio problems
£387.00 is shared between A and B in the ratio 4:5. How much does A receive?
Answer: £172.00 -
5. Statistics Mean
The mean of 5 numbers is 21. If 4 of them are 50, 40, 26, 46, what is the missing number?
Answer: -57