Keystones — Capstone
Five GCSE retrieval questions · 17 December 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
2. Algebra Completing the square
Complete the square: 4x² - 40x - 14
Answer: 4(x - 5)² - 114 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 30cm, angle = 73°. Give your answer to 2 decimal places
Answer: 229.51cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 5:10:16 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 10, 33, 69, 99, 23, 41. Give your answer to 2 decimal places
Answer: Mean = 46.71, Median = 41, Range = 89