Keystones — Capstone
Five GCSE retrieval questions · 17 December 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√44
Answer: 10√11 -
2. Algebra Completing the square
Complete the square: x² + 5x - 1
Answer: (x + 5⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 12cm, angle = 64°. Give your answer to 2 decimal places
Answer: 124.03cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 28:21:15 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 13, 95, 12, 47, 47, 66. Give your answer to 2 decimal places
Answer: Mean = 42.86, Median = 47, Range = 83