Keystones — Lintel
Five GCSE retrieval questions · 9 May 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 680,000,000 in standard form
Answer: 6.8 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 10
Answer: (x + 2)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 46°. Find opposite. Give your answer to 2 decimal places
Answer: 27.96cm -
4. Ratio Mixed ratio problems
Simplify the ratio 6kg : 250g
Answer: 24:1 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 34, 36, 28, what is the missing number?
Answer: 62