Keystones — Capstone
Five GCSE retrieval questions · 13 July 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √490
Answer: 7√10 -
2. Algebra Completing the square
Complete the square: x² + 7x - 11
Answer: (x + 7⁄2)² - 93⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 16cm, angle = 63°. Give your answer to 2 decimal places
Answer: 171.07cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 16:12:3 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 33, 18, 57, 75, 27, 100, 68
Answer: Mean = 59.25, Median = 62.5, Range = 82