Keystones — Lintel
Five GCSE retrieval questions · 17 July 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000078 in standard form
Answer: 7.8 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 15
Answer: (x + 3)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 56°. Find opposite. Give your answer to 2 decimal places
Answer: 44.48cm -
4. Ratio Mixed ratio problems
Divide 232 in the ratio 1:3:4
Answer: 29, 87 and 116 -
5. Statistics Mean
Calculate the mean of: 21, 38, 37, 49, 19, 20, 27. Give your answer to 2 decimal places
Answer: 30.14