Keystones — Capstone
Five GCSE retrieval questions · 21 December 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √294
Answer: 7√6 -
2. Algebra Completing the square
Complete the square: 2x² + 20x + 2
Answer: 2(x + 5)² - 48 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 17cm, angle = 45°. Give your answer to 2 decimal places
Answer: 132.23cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 63:56:16 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 87, 12, 72, 83, 26, 69. Give your answer to 2 decimal places
Answer: Mean = 54.29, Median = 69, Range = 75