Keystones — Capstone
Five GCSE retrieval questions · 31 August 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √294
Answer: 7√6 -
2. Algebra Completing the square
Complete the square: x² - 7x - 10
Answer: (x - 7⁄2)² - 89⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 14cm, angle = 53°. Give your answer to 2 decimal places
Answer: 139.76cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 5:15:9 -
5. Statistics Averages and range
Find the mean, median and range of: 58, 69, 54, 20, 70, 63, 53. Give your answer to 2 decimal places
Answer: Mean = 55.29, Median = 58, Range = 50