Keystones — Capstone
Five GCSE retrieval questions · 6 December 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√20
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: 3x² - 36x + 5
Answer: 3(x - 6)² - 103 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 21cm, angle = 79°. Give your answer to 2 decimal places
Answer: 237.06cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 20:45:54 -
5. Statistics Averages and range
Find the mean, median and range of: 49, 28, 24, 98, 70, 98, 54, 45, 59. Give your answer to 2 decimal places
Answer: Mean = 58.33, Median = 54, Range = 74