Keystones — Capstone
Five GCSE retrieval questions · 24 January 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √200
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: x² - 5x - 4
Answer: (x - 5⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 25cm, angle = 53°. Give your answer to 2 decimal places
Answer: 179.69cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 16:14:63 -
5. Statistics Averages and range
Find the mean, median and range of: 18, 91, 36, 53, 29, 86, 53, 86, 57. Give your answer to 2 decimal places
Answer: Mean = 56.56, Median = 53, Range = 73