Keystones — Capstone
Five GCSE retrieval questions · 6 October 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √250
Answer: 5√10 -
2. Algebra Completing the square
Complete the square: x² + 11x + 4
Answer: (x + 11⁄2)² - 105⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 24cm, angle = 62°. Give your answer to 2 decimal places
Answer: 180.12cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 45:40:16 -
5. Statistics Averages and range
Find the mean, median and range of: 53, 30, 54, 80, 45, 84, 35. Give your answer to 2 decimal places
Answer: Mean = 54.43, Median = 53, Range = 54