Keystones — Capstone
Five GCSE retrieval questions · 13 July 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√20
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: x² - 7x + 1
Answer: (x - 7⁄2)² - 45⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 27cm, angle = 72°. Give your answer to 2 decimal places
Answer: 346.66cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 4:36:45 -
5. Statistics Averages and range
Find the mean, median and range of: 62, 47, 88, 33, 88, 38, 72. Give your answer to 2 decimal places
Answer: Mean = 61.14, Median = 62, Range = 55