Keystones — Capstone
Five GCSE retrieval questions · 25 January 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √180
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: 2x² + 12x - 8
Answer: 2(x + 3)² - 26 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 29cm, angle = 51°. Give your answer to 2 decimal places
Answer: 191.57cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 25:45:54 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 67, 21, 81, 31, 70, 23, 58, 36
Answer: Mean = 49, Median = 54, Range = 60