Keystones — Capstone
Five GCSE retrieval questions · 18 August 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √32
Answer: 4√2 -
2. Algebra Completing the square
Complete the square: x² + 5x + 2
Answer: (x + 5⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 14cm, angle = 68°. Give your answer to 2 decimal places
Answer: 194.71cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 36:28:7 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 62, 87, 67, 100, 29, 38, 38, 62. Give your answer to 2 decimal places
Answer: Mean = 56.44, Median = 62, Range = 75