Keystones — Lintel
Five GCSE retrieval questions · 21 April 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 450,000 in standard form
Answer: 4.5 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 42
Answer: (x + 7)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 57°. Find opposite. Give your answer to 2 decimal places
Answer: 29.26cm -
4. Ratio Mixed ratio problems
Simplify the ratio 1 hour : 45 minutes
Answer: 4:3 -
5. Statistics Mean
The mean of 4 numbers is 27. If 3 of them are 15, 45, 23, what is the missing number?
Answer: 25