Keystones — Capstone
Five GCSE retrieval questions · 9 March 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √363
Answer: 11√3 -
2. Algebra Completing the square
Complete the square: x² + 11x - 5
Answer: (x + 11⁄2)² - 141⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 29cm, angle = 43°. Give your answer to 2 decimal places
Answer: 217.56cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 72:40:35 -
5. Statistics Averages and range
Find the mean, median and range of: 67, 43, 15, 18, 80, 16, 33, 68, 98. Give your answer to 2 decimal places
Answer: Mean = 48.67, Median = 43, Range = 83