Keystones — Lintel
Five GCSE retrieval questions · 29 October 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0087 in standard form
Answer: 8.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 72
Answer: (x + 9)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 57°. Find opposite. Give your answer to 2 decimal places
Answer: 26.18cm -
4. Ratio Mixed ratio problems
Black, white and yellow counters are in the ratio 6:4:8. What fraction of the counters are yellow?
Answer: 4⁄9 -
5. Statistics Mean
The mean of 6 numbers is 37. If 5 of them are 47, 25, 34, 50, 27, what is the missing number?
Answer: 39