Keystones — Lintel
Five GCSE retrieval questions · 14 September 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 530,000,000 in standard form
Answer: 5.3 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 3
Answer: (x + 1)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 51°. Find opposite. Give your answer to 2 decimal places
Answer: 20.99cm -
4. Ratio Mixed ratio problems
Express the first part of 15:8 as a fraction in simplest form
Answer: 15⁄23 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 28, 40, 32, what is the missing number?
Answer: 56