Keystones — Capstone
Five GCSE retrieval questions · 29 April 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √208
Answer: 4√13 -
2. Algebra Completing the square
Complete the square: x² + x - 12
Answer: (x + 1⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 16cm, angle = 79°. Give your answer to 2 decimal places
Answer: 125.65cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 4:18:21 -
5. Statistics Averages and range
Find the mean, median and range of: 71, 91, 36, 15, 51, 79, 14, 81
Answer: Mean = 54.75, Median = 61, Range = 77