Keystones — Capstone
Five GCSE retrieval questions · 27 June 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √300
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: x² - 9x - 7
Answer: (x - 9⁄2)² - 109⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 26cm, angle = 75°. Give your answer to 2 decimal places
Answer: 326.48cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 21:6:10 -
5. Statistics Averages and range
Find the mean, median and range of: 49, 68, 94, 85, 45, 12, 71, 60, 40. Give your answer to 2 decimal places
Answer: Mean = 58.22, Median = 60, Range = 82