Keystones — Lintel
Five GCSE retrieval questions · 30 June 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 430,000,000 in standard form
Answer: 4.3 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 45
Answer: (x + 5)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 33°. Find adjacent side. Give your answer to 2 decimal places
Answer: 32.71cm -
4. Ratio Mixed ratio problems
Orange, purple and pink sweets are in the ratio 10:10:12. What fraction of the sweets are pink?
Answer: 3⁄8 -
5. Statistics Mean
The mean of 4 numbers is 23. If 3 of them are 28, 27, 26, what is the missing number?
Answer: 11