Keystones — Capstone
Five GCSE retrieval questions · 21 September 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√80
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: x² + 7x + 8
Answer: (x + 7⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 12cm, angle = 71°. Give your answer to 2 decimal places
Answer: 124.81cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 8:6:9 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 12, 54, 61, 12, 28, 98. Give your answer to 2 decimal places
Answer: Mean = 48.29, Median = 54, Range = 86