Keystones — Lintel
Five GCSE retrieval questions · 2 January 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 3,300,000 in standard form
Answer: 3.3 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 24
Answer: (x + 6)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 38.54cm -
4. Ratio Mixed ratio problems
Simplify the ratio £1 : 55p
Answer: 20:11 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 45, 29, 16, what is the missing number?
Answer: 58