Keystones — Capstone
Five GCSE retrieval questions · 4 November 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √175
Answer: 5√7 -
2. Algebra Completing the square
Complete the square: x² - 11x - 8
Answer: (x - 11⁄2)² - 153⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 21cm, angle = 60°. Give your answer to 2 decimal places
Answer: 245.52cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 40:45:27 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 46, 56, 75, 94, 83, 18, 19, 40. Give your answer to 2 decimal places
Answer: Mean = 51.11, Median = 46, Range = 76