Keystones — Capstone
Five GCSE retrieval questions · 19 November 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 + 9x - 9
Answer: (x + 9⁄2)² - 117⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 19cm, angle = 74°. Give your answer to 2 decimal places
Answer: 136.98cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 4:12:9 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 32, 34, 42, 87, 42, 29, 22. Give your answer to 2 decimal places
Answer: Mean = 39.13, Median = 33, Range = 65