Keystones — Capstone
Five GCSE retrieval questions · 29 May 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√175
Answer: 20√7 -
2. Algebra Completing the square
Complete the square: x² - 7x + 10
Answer: (x - 7⁄2)² - 9⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 27cm, angle = 63°. Give your answer to 2 decimal places
Answer: 144.34cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 56:63:81 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 61, 93, 33, 34, 10, 83. Give your answer to 2 decimal places
Answer: Mean = 58.57, Median = 61, Range = 86