Keystones — Capstone
Five GCSE retrieval questions · 27 August 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √396
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: x² - 5x - 7
Answer: (x - 5⁄2)² - 53⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 17cm, angle = 43°. Give your answer to 2 decimal places
Answer: 98.55cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 3:21:14 -
5. Statistics Averages and range
Find the mean, median and range of: 38, 53, 13, 74, 13, 56, 24, 39
Answer: Mean = 38.75, Median = 38.5, Range = 61