Keystones — Capstone
Five GCSE retrieval questions · 14 June 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √160
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: x² - 11x - 1
Answer: (x - 11⁄2)² - 125⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 18cm, angle = 42°. Give your answer to 2 decimal places
Answer: 168.62cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 12:10:35 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 21, 58, 36, 95, 69, 26. Give your answer to 2 decimal places
Answer: Mean = 57.29, Median = 58, Range = 75