Keystones — Lintel
Five GCSE retrieval questions · 3 March 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 4,600,000 in standard form
Answer: 4.6 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 72
Answer: (x + 8)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 53°. Find opposite. Give your answer to 2 decimal places
Answer: 31.85cm -
4. Ratio Mixed ratio problems
Express the first part of 7:15 as a fraction in simplest form
Answer: 7⁄22 -
5. Statistics Mean
The mean of 6 numbers is 26. If 5 of them are 30, 40, 38, 21, 16, what is the missing number?
Answer: 11