Keystones — Capstone
Five GCSE retrieval questions · 1 August 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √1000
Answer: 10√10 -
2. Algebra Completing the square
Complete the square: x² + 11x - 1
Answer: (x + 11⁄2)² - 125⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 23cm, angle = 69°. Give your answer to 2 decimal places
Answer: 139.57cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 6:15:20 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 30, 55, 59, 24, 39, 33, 42
Answer: Mean = 41.75, Median = 40.5, Range = 35