Keystones — Capstone
Five GCSE retrieval questions · 21 February 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √48
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: 5x² + 20x - 14
Answer: 5(x + 2)² - 34 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 14cm, angle = 53°. Give your answer to 2 decimal places
Answer: 89.45cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 48:56:21 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 52, 64, 67, 59, 52, 87, 35. Give your answer to 2 decimal places
Answer: Mean = 53.38, Median = 55.5, Range = 76