Keystones — Lintel
Five GCSE retrieval questions · 16 May 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00053 in standard form
Answer: 5.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 32
Answer: (x + 8)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 36°. Find opposite. Give your answer to 2 decimal places
Answer: 20.34cm -
4. Ratio Mixed ratio problems
Divide 78 in the ratio 1:3:2
Answer: 13, 39 and 26 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 42, 50, 28, what is the missing number?
Answer: 20