Keystones — Capstone
Five GCSE retrieval questions · 2 January 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √500
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: x² + 3x - 7
Answer: (x + 3⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 18cm, angle = 49°. Give your answer to 2 decimal places
Answer: 115.47cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 7:14:4 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 68, 55, 35, 95, 44, 60, 21. Give your answer to 2 decimal places
Answer: Mean = 49.63, Median = 49.5, Range = 76