Keystones — Lintel
Five GCSE retrieval questions · 7 April 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 8,200,000 in standard form
Answer: 8.2 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 18x + 80
Answer: (x + 10)(x + 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 57°. Find opposite. Give your answer to 2 decimal places
Answer: 38.5cm -
4. Ratio Mixed ratio problems
Orange, purple and pink sweets are in the ratio 1:10:7. What fraction of the sweets are orange?
Answer: 1⁄18 -
5. Statistics Mean
The mean of 6 numbers is 31. If 5 of them are 30, 20, 40, 24, 30, what is the missing number?
Answer: 42