Keystones — Capstone
Five GCSE retrieval questions · 7 January 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: x² - 7x - 6
Answer: (x - 7⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 20cm, angle = 44°. Give your answer to 2 decimal places
Answer: 104.2cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 63:14:6 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 67, 30, 39, 82, 66, 32, 26
Answer: Mean = 52.25, Median = 52.5, Range = 56