Keystones — Capstone
Five GCSE retrieval questions · 8 December 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √300
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: 4x² + 24x - 4
Answer: 4(x + 3)² - 40 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 12cm, angle = 48°. Give your answer to 2 decimal places
Answer: 53.51cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 81:45:20 -
5. Statistics Averages and range
Find the mean, median and range of: 37, 29, 68, 59, 91, 94, 76, 71, 62. Give your answer to 2 decimal places
Answer: Mean = 65.22, Median = 68, Range = 65