Keystones — Capstone
Five GCSE retrieval questions · 17 July 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√125
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: x² - 7x + 3
Answer: (x - 7⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 26cm, angle = 46°. Give your answer to 2 decimal places
Answer: 205.73cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 25:10:2 -
5. Statistics Averages and range
Find the mean, median and range of: 43, 28, 91, 86, 12, 56, 75. Give your answer to 2 decimal places
Answer: Mean = 55.86, Median = 56, Range = 79