Keystones — Capstone
Five GCSE retrieval questions · 6 June 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √637
Answer: 7√13 -
2. Algebra Completing the square
Complete the square: x² + 11x
Answer: (x + 11⁄2)² - 121⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 12cm, angle = 72°. Give your answer to 2 decimal places
Answer: 159.78cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 56:40:15 -
5. Statistics Averages and range
Find the mean, median and range of: 53, 49, 15, 31, 66, 43, 68, 17, 85. Give your answer to 2 decimal places
Answer: Mean = 47.44, Median = 49, Range = 70