Keystones — Capstone
Five GCSE retrieval questions · 17 January 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√80
Answer: 16√5 -
2. Algebra Completing the square
Complete the square: 5x² - 30x - 7
Answer: 5(x - 3)² - 52 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 14cm, angle = 57°. Give your answer to 2 decimal places
Answer: 82.19cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 20:35:42 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 78, 63, 70, 37, 57, 85. Give your answer to 2 decimal places
Answer: Mean = 66.57, Median = 70, Range = 48