Keystones — Capstone
Five GCSE retrieval questions · 7 May 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √352
Answer: 4√22 -
2. Algebra Completing the square
Complete the square: x² + x - 9
Answer: (x + 1⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 23cm, angle = 79°. Give your answer to 2 decimal places
Answer: 293.51cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 4:10:5 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 46, 33, 78, 100, 39, 38, 22. Give your answer to 2 decimal places
Answer: Mean = 48.13, Median = 38.5, Range = 78