Keystones — Capstone
Five GCSE retrieval questions · 26 February 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√32
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: x² - 9x + 11
Answer: (x - 9⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 15cm, angle = 77°. Give your answer to 2 decimal places
Answer: 146.16cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 15:12:20 -
5. Statistics Averages and range
Find the mean, median and range of: 32, 21, 26, 38, 37, 88, 53, 92. Give your answer to 2 decimal places
Answer: Mean = 48.38, Median = 37.5, Range = 71