Keystones — Lintel
Five GCSE retrieval questions · 6 February 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 340,000,000 in standard form
Answer: 3.4 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 20
Answer: (x + 2)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 59°. Find opposite. Give your answer to 2 decimal places
Answer: 38.28cm -
4. Ratio Mixed ratio problems
Simplify: 12:8:8
Answer: 3:2:2 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 47, 25, 48, 39, what is the missing number?
Answer: 21