Keystones — Capstone
Five GCSE retrieval questions · 29 January 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√175
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: x² - 5x - 6
Answer: (x - 5⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 28cm, angle = 74°. Give your answer to 2 decimal places
Answer: 322.98cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 35:15:9 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 39, 82, 25, 94, 29, 53, 22. Give your answer to 2 decimal places
Answer: Mean = 46.38, Median = 34, Range = 72