Keystones — Lintel
Five GCSE retrieval questions · 1 February 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00081 in standard form
Answer: 8.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 54
Answer: (x + 6)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 36°. Find opposite. Give your answer to 2 decimal places
Answer: 21.8cm -
4. Ratio Mixed ratio problems
Divide 147 in the ratio 2:4:1
Answer: 42, 84 and 21 -
5. Statistics Mean
The mean of 5 numbers is 38. If 4 of them are 45, 38, 45, 44, what is the missing number?
Answer: 18