Keystones — Capstone
Five GCSE retrieval questions · 14 July 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√125
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: x² - 3x + 5
Answer: (x - 3⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 12cm, angle = 75°. Give your answer to 2 decimal places
Answer: 168.07cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 15:40:48 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 72, 61, 19, 100, 83, 100, 55, 53. Give your answer to 2 decimal places
Answer: Mean = 66.56, Median = 61, Range = 81