Keystones — Capstone
Five GCSE retrieval questions · 7 July 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √448
Answer: 8√7 -
2. Algebra Completing the square
Complete the square: x² - 11x - 9
Answer: (x - 11⁄2)² - 157⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 27cm, angle = 65°. Give your answer to 2 decimal places
Answer: 232.47cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 18:63:14 -
5. Statistics Averages and range
Find the mean, median and range of: 32, 58, 63, 44, 40, 48, 75, 33. Give your answer to 2 decimal places
Answer: Mean = 49.13, Median = 46, Range = 43