Keystones — Lintel
Five GCSE retrieval questions · 10 February 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 79,000,000 in standard form
Answer: 7.9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 50
Answer: (x + 5)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 30°. Find opposite. Give your answer to 2 decimal places
Answer: 16.17cm -
4. Ratio Mixed ratio problems
Simplify: 4:12:4
Answer: 1:3:1 -
5. Statistics Mean
The mean of 4 numbers is 20. If 3 of them are 23, 26, 23, what is the missing number?
Answer: 8