Keystones — Lintel
Five GCSE retrieval questions · 20 March 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00045 in standard form
Answer: 4.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 20
Answer: (x + 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 34°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.26cm -
4. Ratio Mixed ratio problems
Red, blue and green beads are in the ratio 8:2:10. What fraction of the beads are red?
Answer: 2⁄5 -
5. Statistics Mean
The mean of 6 numbers is 37. If 5 of them are 24, 42, 36, 50, 45, what is the missing number?
Answer: 25