Keystones — Lintel
Five GCSE retrieval questions · 31 October 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
730000
Answer: 7.3 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 47°. Find adjacent side
Answer: 10.2cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3m:300cm
Answer: 1:100 -
5. Statistics Mean
The mean of 5 numbers is 23. If 4 of them are 16, 28, 48, 26, what is the missing number?
Answer: -3