Keystones — Lintel
Five GCSE retrieval questions · 19 December 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.052
Answer: 5.2 × 10^-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 35°. Find opposite
Answer: 21cm -
4. Ratio Mixed ratio problems
Divide 90 in the ratio 2:1:2
Answer: 36, 18 and 36 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 47, 24, 38, what is the missing number?
Answer: 47