Keystones — Capstone
Five GCSE retrieval questions · 6 April 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√32
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: x² - 7x + 2
Answer: (x - 7⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 18cm, angle = 80°. Give your answer to 2 decimal places
Answer: 221.58cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 20:45:9 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 24, 66, 20, 97, 71, 77. Give your answer to 2 decimal places
Answer: Mean = 57.43, Median = 66, Range = 77