Keystones — Capstone
Five GCSE retrieval questions · 25 June 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√32
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: 3x² + 18x + 2
Answer: 3(x + 3)² - 25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 18cm, angle = 50°. Give your answer to 2 decimal places
Answer: 179.25cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 27:21:7 -
5. Statistics Averages and range
Find the mean, median and range of: 48, 10, 98, 26, 36, 55, 71. Give your answer to 2 decimal places
Answer: Mean = 49.14, Median = 48, Range = 88