Keystones — Capstone
Five GCSE retrieval questions · 8 August 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√99
Answer: 9√11 -
2. Algebra Completing the square
Complete the square: x² + 9x + 7
Answer: (x + 9⁄2)² - 53⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 15cm, angle = 42°. Give your answer to 2 decimal places
Answer: 80.3cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 6:14:21 -
5. Statistics Averages and range
Find the mean, median and range of: 62, 30, 93, 78, 62, 80, 62, 35, 32. Give your answer to 2 decimal places
Answer: Mean = 59.33, Median = 62, Range = 63