Keystones — Capstone
Five GCSE retrieval questions · 3 January 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √272
Answer: 4√17 -
2. Algebra Completing the square
Complete the square: x² - 11x - 2
Answer: (x - 11⁄2)² - 129⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 14cm, angle = 48°. Give your answer to 2 decimal places
Answer: 104.04cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 25:35:21 -
5. Statistics Averages and range
Find the mean, median and range of: 82, 49, 32, 80, 42, 29, 40. Give your answer to 2 decimal places
Answer: Mean = 50.57, Median = 42, Range = 53