Keystones — Capstone
Five GCSE retrieval questions · 2 October 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √600
Answer: 10√6 -
2. Algebra Completing the square
Complete the square: x² + 11x - 6
Answer: (x + 11⁄2)² - 145⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 21cm, angle = 44°. Give your answer to 2 decimal places
Answer: 145.88cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 25:30:54 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 38, 73, 65, 23, 29, 15, 34, 98. Give your answer to 2 decimal places
Answer: Mean = 45.11, Median = 34, Range = 83