Keystones — Capstone
Five GCSE retrieval questions · 18 December 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√175
Answer: 20√7 -
2. Algebra Completing the square
Complete the square: 3x² + 18x - 10
Answer: 3(x + 3)² - 37 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 22cm, angle = 77°. Give your answer to 2 decimal places
Answer: 139.33cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 21:35:20 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 51, 16, 59, 19, 72, 25, 84
Answer: Mean = 52, Median = 55, Range = 74