Keystones — Capstone
Five GCSE retrieval questions · 3 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 + 11x + 9
Answer: (x + 11⁄2)² - 85⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 20cm, angle = 40°. Give your answer to 2 decimal places
Answer: 154.27cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 20:36:63 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 66, 26, 21, 55, 29, 32
Answer: Mean = 45, Median = 32, Range = 65