Keystones — Capstone
Five GCSE retrieval questions · 11 March 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √350
Answer: 5√14 -
2. Algebra Completing the square
Complete the square: x² - x + 10
Answer: (x - 1⁄2)² + 39⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 22cm, angle = 49°. Give your answer to 2 decimal places
Answer: 149.43cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 2:12:15 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 67, 82, 45, 92, 63, 31, 20
Answer: Mean = 51.5, Median = 54, Range = 80