Keystones — Capstone
Five GCSE retrieval questions · 22 November 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√160
Answer: 20√10 -
2. Algebra Completing the square
Complete the square: x² + 11x + 12
Answer: (x + 11⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 23cm, angle = 49°. Give your answer to 2 decimal places
Answer: 216.98cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 21:28:12 -
5. Statistics Averages and range
Find the mean, median and range of: 88, 16, 48, 33, 35, 68, 32, 79. Give your answer to 2 decimal places
Answer: Mean = 49.88, Median = 41.5, Range = 72