Keystones — Capstone
Five GCSE retrieval questions · 14 January 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √50
Answer: 5√2 -
2. Algebra Completing the square
Complete the square: x² + 3x - 2
Answer: (x + 3⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 19cm, angle = 72°. Give your answer to 2 decimal places
Answer: 144.56cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 35:21:15 -
5. Statistics Averages and range
Find the mean, median and range of: 37, 73, 57, 92, 36, 64, 68, 34, 37. Give your answer to 2 decimal places
Answer: Mean = 55.33, Median = 57, Range = 58