Keystones — Lintel
Five GCSE retrieval questions · 10 January 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
70000000
Answer: 7 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 10
Answer: (x + 5)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 45°. Find adjacent side
Answer: 10.6cm -
4. Ratio Mixed ratio problems
Divide 210 in the ratio 2:2:1
Answer: 84, 84 and 42 -
5. Statistics Mean
The mean of 4 numbers is 21. If 3 of them are 29, 48, 28, what is the missing number?
Answer: -21