Keystones — Capstone
Five GCSE retrieval questions · 30 January 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√250
Answer: 25√10 -
2. Algebra Completing the square
Complete the square: 2x² - 12x - 11
Answer: 2(x - 3)² - 29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 13cm, angle = 46°. Give your answer to 2 decimal places
Answer: 93.51cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 54:45:40 -
5. Statistics Averages and range
Find the mean, median and range of: 67, 88, 82, 72, 19, 68, 72, 48
Answer: Mean = 64.5, Median = 70, Range = 69