Keystones — Lintel
Five GCSE retrieval questions · 28 May 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
90000000
Answer: 9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 4
Answer: (x + 4)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 55°. Find adjacent side
Answer: 22.9cm -
4. Ratio Mixed ratio problems
Divide 162 in the ratio 3:4:2
Answer: 54, 72 and 36 -
5. Statistics Mean
The mean of 5 numbers is 38. If 4 of them are 31, 17, 46, 15, what is the missing number?
Answer: 81