Keystones — Capstone
Five GCSE retrieval questions · 8 August 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √72
Answer: 6√2 -
2. Algebra Completing the square
Complete the square: 5x² + 60x - 2
Answer: 5(x + 6)² - 182 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 28cm, angle = 65°. Give your answer to 2 decimal places
Answer: 380.65cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 40:45:54 -
5. Statistics Averages and range
Find the mean, median and range of: 37, 65, 72, 97, 45, 68, 65. Give your answer to 2 decimal places
Answer: Mean = 64.14, Median = 65, Range = 60