Keystones — Capstone
Five GCSE retrieval questions · 27 December 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √550
Answer: 5√22 -
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 = 17cm, b = 12cm, angle = 44°. Give your answer to 2 decimal places
Answer: 70.86cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 14:18:21 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 91, 75, 74, 29, 64, 51. Give your answer to 2 decimal places
Answer: Mean = 58.71, Median = 64, Range = 64