Keystones — Capstone
Five GCSE retrieval questions · 25 May 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √325
Answer: 5√13 -
2. Algebra Completing the square
Complete the square: x² - 7x + 1
Answer: (x - 7⁄2)² - 45⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 24cm, angle = 45°. Give your answer to 2 decimal places
Answer: 161.22cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 72:45:20 -
5. Statistics Averages and range
Find the mean, median and range of: 37, 95, 19, 88, 35, 40, 58, 80
Answer: Mean = 56.5, Median = 49, Range = 76