Keystones — Capstone
Five GCSE retrieval questions · 19 August 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √756
Answer: 6√21 -
2. Algebra Completing the square
Complete the square: 5x² + 40x - 9
Answer: 5(x + 4)² - 89 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 20cm, angle = 74°. Give your answer to 2 decimal places
Answer: 230.7cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 72:45:25 -
5. Statistics Averages and range
Find the mean, median and range of: 100, 93, 81, 90, 47, 18, 100. Give your answer to 2 decimal places
Answer: Mean = 75.57, Median = 90, Range = 82