Keystones — Capstone
Five GCSE retrieval questions · 14 July 2017 · 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 + 24x - 3
Answer: 2(x + 6)² - 75 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 14cm, angle = 71°. Give your answer to 2 decimal places
Answer: 125.75cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 56:63:27 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 30, 52, 60, 61, 35, 47, 61, 31. Give your answer to 2 decimal places
Answer: Mean = 47.44, Median = 50, Range = 31