Keystones — Lintel
Five GCSE retrieval questions · 16 March 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.026 in standard form
Answer: 2.6 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 18
Answer: (x + 3)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 48°. Find opposite. Give your answer to 2 decimal places
Answer: 22.21cm -
4. Ratio Mixed ratio problems
Express the first part of 3:5 as a fraction in simplest form
Answer: 3⁄8 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 33, 17, 24, 35, 50, what is the missing number?
Answer: 57