Keystones — Capstone
Five GCSE retrieval questions · 20 September 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √490
Answer: 7√10 -
2. Algebra Completing the square
Complete the square: 4x² - 40x
Answer: 4(x - 5)² - 100 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 14cm, angle = 72°. Give your answer to 2 decimal places
Answer: 146.46cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 7:21:12 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 67, 84, 66, 60, 56, 71, 84. Give your answer to 2 decimal places
Answer: Mean = 71.63, Median = 69, Range = 29