Keystones — Capstone
Five GCSE retrieval questions · 2 December 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√28
Answer: 4√7 -
2. Algebra Completing the square
Complete the square: x² + 9x - 5
Answer: (x + 9⁄2)² - 101⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 23cm, angle = 71°. Give your answer to 2 decimal places
Answer: 260.96cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 32:36:9 -
5. Statistics Averages and range
Find the mean, median and range of: 72, 89, 19, 64, 100, 64, 60. Give your answer to 2 decimal places
Answer: Mean = 66.86, Median = 64, Range = 81