Keystones — Capstone
Five GCSE retrieval questions · 12 August 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √792
Answer: 6√22 -
2. Algebra Completing the square
Complete the square: 3x² + 6x - 5
Answer: 3(x + 1)² - 8 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 28cm, angle = 72°. Give your answer to 2 decimal places
Answer: 359.5cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 28:36:63 -
5. Statistics Averages and range
Find the mean, median and range of: 58, 37, 41, 39, 50, 16, 81
Answer: Mean = 46, Median = 41, Range = 65