Keystones — Capstone
Five GCSE retrieval questions · 20 January 2017 · 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 - 5x - 7
Answer: (x - 5⁄2)² - 53⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 30cm, angle = 43°. Give your answer to 2 decimal places
Answer: 122.76cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 12:10:35 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 73, 69, 83, 27, 38, 51. Give your answer to 2 decimal places
Answer: Mean = 53.14, Median = 51, Range = 56