Keystones — Lintel
Five GCSE retrieval questions · 13 November 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000097 in standard form
Answer: 9.7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 27
Answer: (x + 3)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 35°. Find adjacent side. Give your answer to 2 decimal places
Answer: 31.95cm -
4. Ratio Mixed ratio problems
Orange, purple and pink counters are in the ratio 8:3:7. What fraction of the counters are pink?
Answer: 7⁄18 -
5. Statistics Mean
The mean of 4 numbers is 33. If 3 of them are 50, 44, 19, what is the missing number?
Answer: 19