Keystones — Lintel
Five GCSE retrieval questions · 6 February 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00038
Answer: 3.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 4
Answer: (x + 4)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 32°. Find opposite
Answer: 13.7cm -
4. Ratio Mixed ratio problems
Divide 90 in the ratio 3:1:2
Answer: 45, 15 and 30 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 40, 15, 15, what is the missing number?
Answer: 90