Keystones — Capstone
Five GCSE retrieval questions · 20 July 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√160
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: x² + 11x - 4
Answer: (x + 11⁄2)² - 137⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 24cm, angle = 73°. Give your answer to 2 decimal places
Answer: 252.46cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 20:35:14 -
5. Statistics Averages and range
Find the mean, median and range of: 65, 15, 76, 88, 53, 89, 84. Give your answer to 2 decimal places
Answer: Mean = 67.14, Median = 76, Range = 74