Keystones — Capstone
Five GCSE retrieval questions · 14 April 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √448
Answer: 8√7 -
2. Algebra Completing the square
Complete the square: x² - 3x - 1
Answer: (x - 3⁄2)² - 13⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 28cm, angle = 69°. Give your answer to 2 decimal places
Answer: 235.26cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 8:18:27 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 38, 72, 53, 81, 91, 59. Give your answer to 2 decimal places
Answer: Mean = 59.29, Median = 59, Range = 70