Keystones — Capstone
Five GCSE retrieval questions · 3 September 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √425
Answer: 5√17 -
2. Algebra Completing the square
Complete the square: 4x² + 48x + 8
Answer: 4(x + 6)² - 136 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 29cm, angle = 41°. Give your answer to 2 decimal places
Answer: 209.28cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 15:35:21 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 28, 15, 80, 29, 19, 18. Give your answer to 2 decimal places
Answer: Mean = 39.14, Median = 28, Range = 70