Keystones — Capstone
Five GCSE retrieval questions · 27 January 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √525
Answer: 5√21 -
2. Algebra Completing the square
Complete the square: 5x² - 50x - 10
Answer: 5(x - 5)² - 135 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 13cm, angle = 57°. Give your answer to 2 decimal places
Answer: 147.19cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 5:20:28 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 38, 34, 70, 49, 46, 55, 95. Give your answer to 2 decimal places
Answer: Mean = 55.38, Median = 52, Range = 61