Keystones — Capstone
Five GCSE retrieval questions · 1 November 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√48
Answer: 20√3 -
2. Algebra Completing the square
Complete the square: x² + 7x + 7
Answer: (x + 7⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 29cm, angle = 55°. Give your answer to 2 decimal places
Answer: 356.33cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 28:21:18 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 98, 43, 90, 58, 62, 87, 93. Give your answer to 2 decimal places
Answer: Mean = 74.88, Median = 77.5, Range = 55