Keystones — Capstone
Five GCSE retrieval questions · 21 January 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √160
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: x² - 7x + 9
Answer: (x - 7⁄2)² - 13⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 12cm, angle = 71°. Give your answer to 2 decimal places
Answer: 153.17cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 28:20:5 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 63, 98, 18, 29, 97, 31, 78. Give your answer to 2 decimal places
Answer: Mean = 55.88, Median = 48, Range = 80