Keystones — Capstone
Five GCSE retrieval questions · 2 July 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √425
Answer: 5√17 -
2. Algebra Completing the square
Complete the square: 4x² - 32x + 3
Answer: 4(x - 4)² - 61 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 13cm, angle = 79°. Give your answer to 2 decimal places
Answer: 127.61cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 20:45:18 -
5. Statistics Averages and range
Find the mean, median and range of: 71, 72, 80, 70, 36, 63, 13, 57, 27. Give your answer to 2 decimal places
Answer: Mean = 54.33, Median = 63, Range = 67