Keystones — Lintel
Five GCSE retrieval questions · 1 August 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00021
Answer: 2.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 14
Answer: (x + 7)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 32°. Find opposite
Answer: 15cm -
4. Ratio Mixed ratio problems
Divide 115 in the ratio 1:2:2
Answer: 23, 46 and 46 -
5. Statistics Mean
The mean of 5 numbers is 20. If 4 of them are 32, 39, 37, 30, what is the missing number?
Answer: -38