Keystones — Capstone
Five GCSE retrieval questions · 24 July 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √405
Answer: 9√5 -
2. Algebra Completing the square
Complete the square: x² + 5x - 1
Answer: (x + 5⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 24cm, angle = 68°. Give your answer to 2 decimal places
Answer: 178.02cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 35:42:18 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 68, 79, 73, 64, 26, 54, 75, 92. Give your answer to 2 decimal places
Answer: Mean = 62.44, Median = 68, Range = 66