Keystones — Lintel
Five GCSE retrieval questions · 26 April 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.039
Answer: 3.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 10
Answer: (x + 5)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 37°. Find adjacent side
Answer: 20.8cm -
4. Ratio Mixed ratio problems
Divide 250 in the ratio 3:4:3
Answer: 75, 100 and 75 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 41, 40, 16, 46, what is the missing number?
Answer: 12