Keystones — Lintel
Five GCSE retrieval questions · 24 January 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00093
Answer: 9.3 × 10^-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 15
Answer: (x - 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 40°. Find opposite
Answer: 15.cm -
4. Ratio Mixed ratio problems
Divide 144 in the ratio 1:1:2
Answer: 36, 36 and 72 -
5. Statistics Mean
The mean of 4 numbers is 23. If 3 of them are 43, 16, 47, what is the missing number?
Answer: -14