Keystones — Capstone
Five GCSE retrieval questions · 19 April 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√12
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: x² + 7x + 2
Answer: (x + 7⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 21cm, angle = 46°. Give your answer to 2 decimal places
Answer: 151.06cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 48:56:35 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 30, 91, 37, 70, 47, 91, 59, 34. Give your answer to 2 decimal places
Answer: Mean = 53.22, Median = 47, Range = 71