Keystones — Capstone
Five GCSE retrieval questions · 7 May 2017 · 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 - 11x - 6
Answer: (x - 11⁄2)² - 145⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 21cm, angle = 54°. Give your answer to 2 decimal places
Answer: 101.94cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 54:45:40 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 46, 88, 100, 91, 66, 25. Give your answer to 2 decimal places
Answer: Mean = 64.57, Median = 66, Range = 75