Keystones — Capstone
Five GCSE retrieval questions · 3 August 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √50
Answer: 5√2 -
2. Algebra Completing the square
Complete the square: x² - x + 11
Answer: (x - 1⁄2)² + 43⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 16cm, angle = 60°. Give your answer to 2 decimal places
Answer: 83.14cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 16:28:35 -
5. Statistics Averages and range
Find the mean, median and range of: 49, 58, 76, 36, 84, 98, 72, 35, 51. Give your answer to 2 decimal places
Answer: Mean = 62.11, Median = 58, Range = 63