Keystones — Capstone
Five GCSE retrieval questions · 2 November 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √48
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: x² - 9x - 10
Answer: (x - 9⁄2)² - 121⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 27cm, angle = 45°. Give your answer to 2 decimal places
Answer: 276.83cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 8:18:45 -
5. Statistics Averages and range
Find the mean, median and range of: 77, 99, 30, 57, 61, 97, 43, 63. Give your answer to 2 decimal places
Answer: Mean = 65.88, Median = 62, Range = 69