Keystones — Lintel
Five GCSE retrieval questions · 14 August 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 48,000 in standard form
Answer: 4.8 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 8
Answer: (x + 2)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 31°. Find opposite. Give your answer to 2 decimal places
Answer: 9.61cm -
4. Ratio Mixed ratio problems
Simplify the ratio 7m : 15cm
Answer: 140:3 -
5. Statistics Mean
The mean of 4 numbers is 38. If 3 of them are 49, 27, 36, what is the missing number?
Answer: 40