Keystones — Capstone
Five GCSE retrieval questions · 29 July 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√275
Answer: 10√11 -
2. Algebra Completing the square
Complete the square: 2x² - 12x - 13
Answer: 2(x - 3)² - 31 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 19cm, angle = 62°. Give your answer to 2 decimal places
Answer: 100.66cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 2:14:35 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 75, 74, 66, 100, 12, 84, 65, 98. Give your answer to 2 decimal places
Answer: Mean = 73.89, Median = 75, Range = 88