Keystones — Capstone
Five GCSE retrieval questions · 11 February 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² + 9x + 12
Answer: (x + 9⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 24cm, angle = 62°. Give your answer to 2 decimal places
Answer: 148.34cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 24:21:14 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 14, 19, 29, 85, 98, 39. Give your answer to 2 decimal places
Answer: Mean = 52.57, Median = 39, Range = 84