Keystones — Capstone
Five GCSE retrieval questions · 5 July 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √525
Answer: 5√21 -
2. Algebra Completing the square
Complete the square: x² + 5x - 11
Answer: (x + 5⁄2)² - 69⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 17cm, angle = 50°. Give your answer to 2 decimal places
Answer: 195.34cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 5:30:18 -
5. Statistics Averages and range
Find the mean, median and range of: 67, 54, 71, 27, 14, 30, 46, 14, 12. Give your answer to 2 decimal places
Answer: Mean = 37.22, Median = 30, Range = 59