Keystones — Capstone
Five GCSE retrieval questions · 8 June 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √500
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: 2x² + 4x - 13
Answer: 2(x + 1)² - 15 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 16cm, angle = 59°. Give your answer to 2 decimal places
Answer: 198.86cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 54:63:35 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 72, 24, 50, 95, 77, 78, 51. Give your answer to 2 decimal places
Answer: Mean = 65.63, Median = 74.5, Range = 71