Keystones — Lintel
Five GCSE retrieval questions · 18 February 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.03 in standard form
Answer: 3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 30
Answer: (x + 3)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 26°. Find adjacent side. Give your answer to 2 decimal places
Answer: 34.15cm -
4. Ratio Mixed ratio problems
Red and blue beads are in the ratio 4:14. What fraction of the beads are red?
Answer: 2⁄9 -
5. Statistics Mean
The mean of 6 numbers is 39. If 5 of them are 27, 39, 37, 28, 42, what is the missing number?
Answer: 61