Keystones — Lintel
Five GCSE retrieval questions · 25 April 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00056 in standard form
Answer: 5.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 4
Answer: (x + 1)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 55°. Find opposite. Give your answer to 2 decimal places
Answer: 22.85cm -
4. Ratio Mixed ratio problems
Orange, purple and pink marbles are in the ratio 7:4:5. What fraction of the marbles are pink?
Answer: 5⁄16 -
5. Statistics Mean
The mean of 6 numbers is 34. If 5 of them are 50, 20, 48, 19, 32, what is the missing number?
Answer: 35