Keystones — Lintel
Five GCSE retrieval questions · 7 August 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.011
Answer: 1.1 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 33°. Find opposite
Answer: 13cm -
4. Ratio Mixed ratio problems
Divide 154 in the ratio 3:3:1
Answer: 66, 66 and 22 -
5. Statistics Mean
The mean of 6 numbers is 32. If 5 of them are 41, 22, 31, 42, 29, what is the missing number?
Answer: 27