Keystones — Lintel
Five GCSE retrieval questions · 22 July 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 130,000 in standard form
Answer: 1.3 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 24
Answer: (x + 4)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 35°. Find opposite. Give your answer to 2 decimal places
Answer: 9.8cm -
4. Ratio Mixed ratio problems
Red and blue beads are in the ratio 3:15. What fraction of the beads are blue?
Answer: 5⁄6 -
5. Statistics Mean
The mean of 6 numbers is 31. If 5 of them are 35, 39, 21, 38, 17, what is the missing number?
Answer: 36