Keystones — Capstone
Five GCSE retrieval questions · 18 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: x² - 5x - 10
Answer: (x - 5⁄2)² - 65⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 30cm, angle = 55°. Give your answer to 2 decimal places
Answer: 196.6cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 21:24:8 -
5. Statistics Averages and range
Find the mean, median and range of: 22, 89, 66, 21, 64, 55, 87. Give your answer to 2 decimal places
Answer: Mean = 57.71, Median = 64, Range = 68