Keystones — Capstone
Five GCSE retrieval questions · 7 December 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √48
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: x² - 3x - 5
Answer: (x - 3⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 18cm, angle = 45°. Give your answer to 2 decimal places
Answer: 95.46cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 5:10:12 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 26, 39, 24, 57, 90, 38. Give your answer to 2 decimal places
Answer: Mean = 41.57, Median = 38, Range = 73