Keystones — Lintel
Five GCSE retrieval questions · 22 December 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0099
Answer: 9.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 35
Answer: (x + 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 53°. Find adjacent side
Answer: 9cm -
4. Ratio Mixed ratio problems
Simplify: 6:8:12
Answer: 3:4:6 -
5. Statistics Mean
The mean of 4 numbers is 33. If 3 of them are 41, 20, 49, what is the missing number?
Answer: 22