Keystones — Capstone
Five GCSE retrieval questions · 19 April 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√20
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: x² + 11x - 4
Answer: (x + 11⁄2)² - 137⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 29cm, angle = 45°. Give your answer to 2 decimal places
Answer: 215.31cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 12:15:10 -
5. Statistics Averages and range
Find the mean, median and range of: 49, 78, 18, 77, 31, 46, 64, 14, 30. Give your answer to 2 decimal places
Answer: Mean = 45.22, Median = 46, Range = 64