Keystones — Capstone
Five GCSE retrieval questions · 25 December 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√24
Answer: 8√6 -
2. Algebra Completing the square
Complete the square: x² - 9x + 9
Answer: (x - 9⁄2)² - 45⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 28cm, angle = 49°. Give your answer to 2 decimal places
Answer: 316.98cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 3:21:35 -
5. Statistics Averages and range
Find the mean, median and range of: 62, 71, 51, 63, 97, 43, 83. Give your answer to 2 decimal places
Answer: Mean = 67.14, Median = 63, Range = 54