Keystones — Capstone
Five GCSE retrieval questions · 11 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: 5x² + 60x + 7
Answer: 5(x + 6)² - 173 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 15cm, angle = 50°. Give your answer to 2 decimal places
Answer: 68.94cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 21:24:64 -
5. Statistics Averages and range
Find the mean, median and range of: 16, 78, 77, 17, 53, 26, 70, 66, 93. Give your answer to 2 decimal places
Answer: Mean = 55.11, Median = 66, Range = 77