Keystones — Capstone
Five GCSE retrieval questions · 28 July 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√28
Answer: 8√7 -
2. Algebra Completing the square
Complete the square: x² - x - 2
Answer: (x - 1⁄2)² - 9⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 20cm, angle = 56°. Give your answer to 2 decimal places
Answer: 248.71cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 15:35:28 -
5. Statistics Averages and range
Find the mean, median and range of: 51, 79, 12, 76, 100, 37, 41, 15, 77. Give your answer to 2 decimal places
Answer: Mean = 54.22, Median = 51, Range = 88