Keystones — Capstone
Five GCSE retrieval questions · 13 April 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
2. Algebra Completing the square
Complete the square: 5x² + 30x + 6
Answer: 5(x + 3)² - 39 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 29cm, angle = 52°. Give your answer to 2 decimal places
Answer: 331.36cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 49:42:24 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 58, 39, 62, 28, 90, 36. Give your answer to 2 decimal places
Answer: Mean = 49.14, Median = 39, Range = 62