Keystones — Capstone
Five GCSE retrieval questions · 28 December 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √50
Answer: 5√2 -
2. Algebra Completing the square
Complete the square: x² - 9x
Answer: (x - 9⁄2)² - 81⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 18cm, angle = 44°. Give your answer to 2 decimal places
Answer: 162.55cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 32:28:7 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 100, 16, 80, 85, 44, 30, 18. Give your answer to 2 decimal places
Answer: Mean = 49.13, Median = 37, Range = 84