Keystones — Capstone
Five GCSE retrieval questions · 14 January 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √684
Answer: 6√19 -
2. Algebra Completing the square
Complete the square: 2x² - 24x - 7
Answer: 2(x - 6)² - 79 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 18cm, angle = 75°. Give your answer to 2 decimal places
Answer: 139.09cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 7:42:12 -
5. Statistics Averages and range
Find the mean, median and range of: 94, 80, 43, 86, 69, 32, 49, 47
Answer: Mean = 62.5, Median = 59, Range = 62