Keystones — Lintel
Five GCSE retrieval questions · 19 May 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 570,000,000 in standard form
Answer: 5.7 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 28
Answer: (x + 4)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 58°. Find opposite. Give your answer to 2 decimal places
Answer: 38.41cm -
4. Ratio Mixed ratio problems
Express the second part of 4:2 as a fraction in simplest form
Answer: 1⁄3 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 47, 26, 41, 42, 19, what is the missing number?
Answer: 5