Keystones — Capstone
Five GCSE retrieval questions · 30 October 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √180
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: x² - 11x + 10
Answer: (x - 11⁄2)² - 81⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 16cm, angle = 57°. Give your answer to 2 decimal places
Answer: 161.02cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 25:30:12 -
5. Statistics Averages and range
Find the mean, median and range of: 53, 44, 60, 65, 31, 32, 36. Give your answer to 2 decimal places
Answer: Mean = 45.86, Median = 44, Range = 34