Keystones — Capstone
Five GCSE retrieval questions · 1 October 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √504
Answer: 6√14 -
2. Algebra Completing the square
Complete the square: 3x² - 24x - 1
Answer: 3(x - 4)² - 49 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 28cm, angle = 61°. Give your answer to 2 decimal places
Answer: 232.65cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 49:35:40 -
5. Statistics Averages and range
Find the mean, median and range of: 67, 45, 74, 10, 67, 17, 59. Give your answer to 2 decimal places
Answer: Mean = 48.43, Median = 59, Range = 64