Keystones — Capstone
Five GCSE retrieval questions · 18 March 2015 · 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 - 11x - 4
Answer: (x - 11⁄2)² - 137⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 20cm, angle = 76°. Give your answer to 2 decimal places
Answer: 281.39cm² -
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: 25, 79, 93, 13, 39, 22, 24. Give your answer to 2 decimal places
Answer: Mean = 42.14, Median = 25, Range = 80