Keystones — Lintel
Five GCSE retrieval questions · 16 October 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0028 in standard form
Answer: 2.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 48
Answer: (x + 6)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 27°. Find adjacent side. Give your answer to 2 decimal places
Answer: 25.84cm -
4. Ratio Mixed ratio problems
Red, blue and green beads are in the ratio 11:6:12. What fraction of the beads are green?
Answer: 12⁄29 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 19, 25, 33, 18, what is the missing number?
Answer: 60