Keystones — Capstone
Five GCSE retrieval questions · 17 January 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√96
Answer: 20√6 -
2. Algebra Completing the square
Complete the square: x² + 3x - 2
Answer: (x + 3⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 23cm, angle = 67°. Give your answer to 2 decimal places
Answer: 243.47cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 5:45:81 -
5. Statistics Averages and range
Find the mean, median and range of: 67, 89, 99, 35, 71, 43, 21, 91, 65. Give your answer to 2 decimal places
Answer: Mean = 64.56, Median = 67, Range = 78