Keystones — Capstone
Five GCSE retrieval questions · 8 June 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√48
Answer: 20√3 -
2. Algebra Completing the square
Complete the square: x² - 7x + 4
Answer: (x - 7⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 27cm, angle = 48°. Give your answer to 2 decimal places
Answer: 120.39cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 5:40:56 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 35, 27, 84, 58, 49, 98, 67, 39. Give your answer to 2 decimal places
Answer: Mean = 53.56, Median = 49, Range = 73