Keystones — Capstone
Five GCSE retrieval questions · 17 March 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√75
Answer: 25√3 -
2. Algebra Completing the square
Complete the square: x² - 11x - 3
Answer: (x - 11⁄2)² - 133⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 21cm, angle = 43°. Give your answer to 2 decimal places
Answer: 100.25cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 24:21:14 -
5. Statistics Averages and range
Find the mean, median and range of: 65, 25, 54, 72, 83, 81, 30. Give your answer to 2 decimal places
Answer: Mean = 58.57, Median = 65, Range = 58