Keystones — Capstone
Five GCSE retrieval questions · 1 August 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √48
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: 2x² - 4x + 14
Answer: 2(x - 1)² + 12 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 19cm, angle = 48°. Give your answer to 2 decimal places
Answer: 91.78cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 35:20:24 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 38, 100, 10, 45, 15, 68. Give your answer to 2 decimal places
Answer: Mean = 52.43, Median = 45, Range = 90