Keystones — Lintel
Five GCSE retrieval questions · 12 September 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000056 in standard form
Answer: 5.6 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 90
Answer: (x + 9)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 33°. Find adjacent side. Give your answer to 2 decimal places
Answer: 28.51cm -
4. Ratio Mixed ratio problems
Red, blue and green beads are in the ratio 1:5:5. What fraction of the beads are red?
Answer: 1⁄11 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 24, 45, 20, 30, what is the missing number?
Answer: 61