Keystones — Capstone
Five GCSE retrieval questions · 7 March 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: x² - 7x - 8
Answer: (x - 7⁄2)² - 81⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 19cm, angle = 43°. Give your answer to 2 decimal places
Answer: 103.66cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 56:21:6 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 80, 61, 69, 99, 98, 80, 76, 34. Give your answer to 2 decimal places
Answer: Mean = 68.67, Median = 76, Range = 78