Keystones — Capstone
Five GCSE retrieval questions · 3 October 2012 · 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 + 16x + 7
Answer: 2(x + 4)² - 25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 25cm, angle = 46°. Give your answer to 2 decimal places
Answer: 260.76cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 12:15:35 -
5. Statistics Averages and range
Find the mean, median and range of: 99, 39, 16, 86, 52, 57, 94, 50. Give your answer to 2 decimal places
Answer: Mean = 61.63, Median = 54.5, Range = 83