Keystones — Lintel
Five GCSE retrieval questions · 12 December 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 870,000,000 in standard form
Answer: 8.7 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 20
Answer: (x + 2)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 48°. Find opposite. Give your answer to 2 decimal places
Answer: 25.54cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2kg : 800g
Answer: 5:2 -
5. Statistics Mean
The mean of 4 numbers is 22. If 3 of them are 33, 18, 30, what is the missing number?
Answer: 7