Keystones — Capstone
Five GCSE retrieval questions · 10 April 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √891
Answer: 9√11 -
2. Algebra Completing the square
Complete the square: x² + 7x + 11
Answer: (x + 7⁄2)² - 5⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 29cm, angle = 42°. Give your answer to 2 decimal places
Answer: 174.64cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 81:72:8 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 71, 90, 45, 30, 96, 30. Give your answer to 2 decimal places
Answer: Mean = 53.86, Median = 45, Range = 81