Keystones — Capstone
Five GCSE retrieval questions · 2 February 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √600
Answer: 10√6 -
2. Algebra Completing the square
Complete the square: 2x² - 20x - 3
Answer: 2(x - 5)² - 53 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 15cm, angle = 59°. Give your answer to 2 decimal places
Answer: 128.58cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 56:21:9 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 83, 50, 99, 45, 71, 39, 36, 66. Give your answer to 2 decimal places
Answer: Mean = 61.44, Median = 64, Range = 63