Keystones — Capstone
Five GCSE retrieval questions · 2 August 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√90
Answer: 15√10 -
2. Algebra Completing the square
Complete the square: x² + 11x - 7
Answer: (x + 11⁄2)² - 149⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 12cm, angle = 54°. Give your answer to 2 decimal places
Answer: 101.94cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 45:10:12 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 87, 25, 79, 72, 29, 89. Give your answer to 2 decimal places
Answer: Mean = 66.57, Median = 79, Range = 64