Keystones — Lintel
Five GCSE retrieval questions · 10 December 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000054 in standard form
Answer: 5.4 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 50
Answer: (x + 5)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 32cm, angle = 57°. Find adjacent side. Give your answer to 2 decimal places
Answer: 17.43cm -
4. Ratio Mixed ratio problems
Black and white beads are in the ratio 5:10. What fraction of the beads are black?
Answer: 1⁄3 -
5. Statistics Mean
The mean of 5 numbers is 23. If 4 of them are 15, 35, 25, 17, what is the missing number?
Answer: 23