Keystones — Capstone
Five GCSE retrieval questions · 21 July 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √640
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: x² + 9x - 3
Answer: (x + 9⁄2)² - 93⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 22cm, angle = 52°. Give your answer to 2 decimal places
Answer: 242.71cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 4:36:9 -
5. Statistics Averages and range
Find the mean, median and range of: 44, 53, 64, 81, 57, 35, 98, 74
Answer: Mean = 63.25, Median = 60.5, Range = 63