Keystones — Lintel
Five GCSE retrieval questions · 17 May 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 68,000,000 in standard form
Answer: 6.8 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 4
Answer: (x + 1)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 60°. Find opposite. Give your answer to 2 decimal places
Answer: 24.25cm -
4. Ratio Mixed ratio problems
Red, blue and green beads are in the ratio 9:7:12. What fraction of the beads are green?
Answer: 3⁄7 -
5. Statistics Mean
The mean of 5 numbers is 37. If 4 of them are 29, 42, 17, 35, what is the missing number?
Answer: 62