Keystones — Capstone
Five GCSE retrieval questions · 14 November 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√12
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: 2x² - 24x + 12
Answer: 2(x - 6)² - 60 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 30cm, angle = 47°. Give your answer to 2 decimal places
Answer: 186.5cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 72:56:35 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 47, 42, 55, 74, 66, 76, 92. Give your answer to 2 decimal places
Answer: Mean = 68.63, Median = 70, Range = 55