Keystones — Lintel
Five GCSE retrieval questions · 26 October 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0027
Answer: 2.7 × 10^-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 36
Answer: (x - 6)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 51°. Find opposite
Answer: 12.3cm -
4. Ratio Mixed ratio problems
Divide 78 in the ratio 4:1:1
Answer: 52, 13 and 13 -
5. Statistics Mean
The mean of 6 numbers is 22. If 5 of them are 26, 27, 43, 46, 29, what is the missing number?
Answer: -39