Keystones — Lintel
Five GCSE retrieval questions · 10 March 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 7,000,000 in standard form
Answer: 7 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 15
Answer: (x - 3)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 16.68cm -
4. Ratio Mixed ratio problems
Black, white and yellow counters are in the ratio 7:5:3. What fraction of the counters are yellow?
Answer: 1⁄5 -
5. Statistics Mean
The mean of 5 numbers is 38. If 4 of them are 34, 49, 17, 41, what is the missing number?
Answer: 49