Keystones — Lintel
Five GCSE retrieval questions · 8 June 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
790000
Answer: 7.9 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 30
Answer: (x + 6)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 31°. Find adjacent side
Answer: 14.6cm -
4. Ratio Mixed ratio problems
Divide 261 in the ratio 3:2:4
Answer: 87, 58 and 116 -
5. Statistics Mean
The mean of 4 numbers is 26. If 3 of them are 15, 33, 49, what is the missing number?
Answer: 7