Keystones — Capstone
Five GCSE retrieval questions · 20 April 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √810
Answer: 9√10 -
2. Algebra Completing the square
Complete the square: x² - x + 3
Answer: (x - 1⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 21cm, angle = 50°. Give your answer to 2 decimal places
Answer: 112.61cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 18:42:49 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 64, 41, 59, 51, 26, 40. Give your answer to 2 decimal places
Answer: Mean = 49.86, Median = 51, Range = 42