Keystones — Capstone
Five GCSE retrieval questions · 10 January 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √240
Answer: 4√15 -
2. Algebra Completing the square
Complete the square: x² - 5x + 2
Answer: (x - 5⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 29cm, angle = 56°. Give your answer to 2 decimal places
Answer: 156.27cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 18:10:35 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 91, 83, 79, 64, 21, 84. Give your answer to 2 decimal places
Answer: Mean = 72.43, Median = 83, Range = 70