Keystones — Lintel
Five GCSE retrieval questions · 22 February 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.085 in standard form
Answer: 8.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 5
Answer: (x + 1)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 43°. Find opposite. Give your answer to 2 decimal places
Answer: 27.98cm -
4. Ratio Mixed ratio problems
Simplify the ratio 6kg : 250g
Answer: 24:1 -
5. Statistics Mean
The mean of 6 numbers is 33. If 5 of them are 24, 48, 41, 23, 45, what is the missing number?
Answer: 17