Keystones — Lintel
Five GCSE retrieval questions · 11 November 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.016
Answer: 1.6 × 10^-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 18
Answer: (x - 3)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 30°. Find opposite
Answer: 12.7cm -
4. Ratio Mixed ratio problems
Divide 234 in the ratio 4:1:4
Answer: 104, 26 and 104 -
5. Statistics Mean
The mean of 5 numbers is 26. If 4 of them are 40, 27, 17, 32, what is the missing number?
Answer: 14