Keystones — Lintel
Five GCSE retrieval questions · 5 March 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 6,900,000 in standard form
Answer: 6.9 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 120
Answer: (x + 12)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 35°. Find opposite. Give your answer to 2 decimal places
Answer: 9.8cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3 litres : 750 ml
Answer: 4:1 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 50, 22, 48, what is the missing number?
Answer: 36