Keystones — Lintel
Five GCSE retrieval questions · 28 January 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.097 in standard form
Answer: 9.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 80
Answer: (x + 8)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 44°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.39cm -
4. Ratio Mixed ratio problems
Orange, purple and pink marbles are in the ratio 5:6:2. What fraction of the marbles are pink?
Answer: 2⁄13 -
5. Statistics Mean
The mean of 5 numbers is 40. If 4 of them are 50, 40, 43, 16, what is the missing number?
Answer: 51