Keystones — Capstone
Five GCSE retrieval questions · 20 February 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √80
Answer: 4√5 -
2. Algebra Completing the square
Complete the square: x² - 5x + 1
Answer: (x - 5⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 19cm, angle = 53°. Give your answer to 2 decimal places
Answer: 220.02cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 36:63:7 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 87, 89, 97, 16, 23, 32, 91. Give your answer to 2 decimal places
Answer: Mean = 60.13, Median = 66.5, Range = 81