Keystones — Capstone
Five GCSE retrieval questions · 21 August 2014 · 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 - 7
Answer: (x - 11⁄2)² - 149⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 25cm, angle = 40°. Give your answer to 2 decimal places
Answer: 120.52cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 9:63:49 -
5. Statistics Averages and range
Find the mean, median and range of: 49, 95, 48, 44, 24, 60, 20, 53, 35. Give your answer to 2 decimal places
Answer: Mean = 47.56, Median = 48, Range = 75