Keystones — Lintel
Five GCSE retrieval questions · 15 January 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 7,900,000 in standard form
Answer: 7.9 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 15x + 36
Answer: (x - 3)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 42°. Find opposite. Give your answer to 2 decimal places
Answer: 25.21cm -
4. Ratio Mixed ratio problems
Express the second part of 13:7 as a fraction in simplest form
Answer: 7⁄20 -
5. Statistics Mean
The mean of 6 numbers is 35. If 5 of them are 25, 35, 45, 22, 37, what is the missing number?
Answer: 46