Keystones — Capstone
Five GCSE retrieval questions · 8 August 2016 · 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 - 10x + 12
Answer: 5(x - 1)² + 7 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 29cm, angle = 78°. Give your answer to 2 decimal places
Answer: 255.3cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 9:12:16 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 95, 43, 45, 22, 28, 78, 22. Give your answer to 2 decimal places
Answer: Mean = 52.13, Median = 44, Range = 73