Keystones — Capstone
Five GCSE retrieval questions · 14 March 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: x² - 7x - 3
Answer: (x - 7⁄2)² - 61⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 12cm, angle = 48°. Give your answer to 2 decimal places
Answer: 66.88cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 16:56:35 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 15, 42, 24, 62, 89, 22
Answer: Mean = 39, Median = 24, Range = 74