Keystones — Lintel
Five GCSE retrieval questions · 17 September 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 70,000,000 in standard form
Answer: 7 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x + 12
Answer: (x + 6)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 33cm, angle = 60°. Find adjacent side
Answer: 16.5cm -
4. Ratio Mixed ratio problems
Red and blue beads are in the ratio 8:3. What fraction of the beads are blue?
Answer: 3⁄11 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 48, 37, 17, 21, what is the missing number?
Answer: 47