Keystones — Capstone
Five GCSE retrieval questions · 23 April 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √384
Answer: 8√6 -
2. Algebra Completing the square
Complete the square: x² - 3x + 11
Answer: (x - 3⁄2)² + 35⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 13cm, angle = 64°. Give your answer to 2 decimal places
Answer: 99.32cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 14:12:9 -
5. Statistics Averages and range
Find the mean, median and range of: 95, 66, 84, 47, 76, 99, 98. Give your answer to 2 decimal places
Answer: Mean = 80.71, Median = 84, Range = 52