Keystones — Capstone
Five GCSE retrieval questions · 17 July 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √490
Answer: 7√10 -
2. Algebra Completing the square
Complete the square: x² - 7x - 1
Answer: (x - 7⁄2)² - 53⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 28cm, angle = 61°. Give your answer to 2 decimal places
Answer: 244.89cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 15:21:14 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 38, 63, 91, 44, 65, 70. Give your answer to 2 decimal places
Answer: Mean = 66.86, Median = 65, Range = 59