Keystones — Capstone
Five GCSE retrieval questions · 4 March 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √792
Answer: 6√22 -
2. Algebra Completing the square
Complete the square: x² + 7x + 6
Answer: (x + 7⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 22cm, angle = 45°. Give your answer to 2 decimal places
Answer: 93.34cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 25:30:54 -
5. Statistics Averages and range
Find the mean, median and range of: 38, 36, 19, 11, 33, 25, 42. Give your answer to 2 decimal places
Answer: Mean = 29.14, Median = 33, Range = 31