Keystones — Lintel
Five GCSE retrieval questions · 8 May 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 75,000,000 in standard form
Answer: 7.5 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 20
Answer: (x + 2)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 37°. Find opposite. Give your answer to 2 decimal places
Answer: 15.82cm -
4. Ratio Mixed ratio problems
Simplify: 18:18:15
Answer: 6:6:5 -
5. Statistics Mean
The mean of 4 numbers is 32. If 3 of them are 32, 24, 25, what is the missing number?
Answer: 47