Keystones — Capstone
Five GCSE retrieval questions · 9 November 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √640
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: x² - 11x - 8
Answer: (x - 11⁄2)² - 153⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 22cm, angle = 56°. Give your answer to 2 decimal places
Answer: 237.cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 9:45:25 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 18, 28, 97, 75, 64, 30, 89, 39. Give your answer to 2 decimal places
Answer: Mean = 52.56, Median = 39, Range = 79