Keystones — Lintel
Five GCSE retrieval questions · 8 May 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00064 in standard form
Answer: 6.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 14
Answer: (x + 2)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 34°. Find opposite. Give your answer to 2 decimal places
Answer: 17.54cm -
4. Ratio Mixed ratio problems
Express the first part of 6:9 as a fraction in simplest form
Answer: 2⁄5 -
5. Statistics Mean
The mean of 5 numbers is 24. If 4 of them are 16, 30, 45, 17, what is the missing number?
Answer: 12