Keystones — Capstone
Five GCSE retrieval questions · 4 December 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√24
Answer: 4√6 -
2. Algebra Completing the square
Complete the square: x² - 9x + 6
Answer: (x - 9⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 15cm, angle = 56°. Give your answer to 2 decimal places
Answer: 111.92cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 7:14:10 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 70, 58, 56, 76, 79, 22, 14, 84. Give your answer to 2 decimal places
Answer: Mean = 59.67, Median = 70, Range = 70