Keystones — Capstone
Five GCSE retrieval questions · 17 February 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √700
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: x² - x + 9
Answer: (x - 1⁄2)² + 35⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 13cm, angle = 69°. Give your answer to 2 decimal places
Answer: 151.71cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 40:35:63 -
5. Statistics Averages and range
Find the mean, median and range of: 10, 58, 15, 85, 98, 71, 25. Give your answer to 2 decimal places
Answer: Mean = 51.71, Median = 58, Range = 88