Keystones — Capstone
Five GCSE retrieval questions · 11 June 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √125
Answer: 5√5 -
2. Algebra Completing the square
Complete the square: x² - 7x + 10
Answer: (x - 7⁄2)² - 9⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 12cm, angle = 46°. Give your answer to 2 decimal places
Answer: 129.48cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 14:18:21 -
5. Statistics Averages and range
Find the mean, median and range of: 65, 61, 47, 57, 17, 60, 93. Give your answer to 2 decimal places
Answer: Mean = 57.14, Median = 60, Range = 76