Keystones — Capstone
Five GCSE retrieval questions · 2 July 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √300
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: x² - 5x + 7
Answer: (x - 5⁄2)² + 3⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 17cm, angle = 65°. Give your answer to 2 decimal places
Answer: 192.59cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 15:24:20 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 70, 34, 75, 75, 68, 74, 22. Give your answer to 2 decimal places
Answer: Mean = 55.63, Median = 69, Range = 53