Keystones — Capstone
Five GCSE retrieval questions · 8 December 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √396
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: 5x² + 10x - 8
Answer: 5(x + 1)² - 13 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 26cm, angle = 65°. Give your answer to 2 decimal places
Answer: 223.86cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 9:12:14 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 94, 50, 50, 39, 10, 35, 32. Give your answer to 2 decimal places
Answer: Mean = 47.88, Median = 44.5, Range = 84