Keystones — Lintel
Five GCSE retrieval questions · 13 December 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 37,000 in standard form
Answer: 3.7 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 54
Answer: (x + 6)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 36°. Find opposite. Give your answer to 2 decimal places
Answer: 16.71cm -
4. Ratio Mixed ratio problems
Orange and purple counters are in the ratio 9:5. What fraction of the counters are orange?
Answer: 9⁄14 -
5. Statistics Mean
The mean of 6 numbers is 32. If 5 of them are 23, 37, 25, 28, 23, what is the missing number?
Answer: 56