Keystones — Capstone
Five GCSE retrieval questions · 21 August 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√250
Answer: 10√10 -
2. Algebra Completing the square
Complete the square: x² + x - 7
Answer: (x + 1⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 20cm, angle = 64°. Give your answer to 2 decimal places
Answer: 251.66cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 27:24:40 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 67, 43, 69, 80, 12, 39, 73. Give your answer to 2 decimal places
Answer: Mean = 52.38, Median = 55, Range = 68