Keystones — Capstone
Five GCSE retrieval questions · 4 February 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √640
Answer: 8√10 -
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 = 23cm, b = 18cm, angle = 60°. Give your answer to 2 decimal places
Answer: 179.27cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 32:28:7 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 20, 83, 56, 83, 76, 90. Give your answer to 2 decimal places
Answer: Mean = 62.43, Median = 76, Range = 70