Keystones — Lintel
Five GCSE retrieval questions · 11 July 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.041
Answer: 4.1 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x + 9
Answer: (x - 3)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 42°. Find opposite
Answer: 9cm -
4. Ratio Mixed ratio problems
£162.00 is shared between A and B in the ratio 1:2. How much does A receive?
Answer: £54.00 -
5. Statistics Mean
The mean of 6 numbers is 39. If 5 of them are 37, 37, 30, 20, 21, what is the missing number?
Answer: 89