Keystones — Capstone
Five GCSE retrieval questions · 21 September 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√32
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: 3x² - 6x - 4
Answer: 3(x - 1)² - 7 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 15cm, angle = 77°. Give your answer to 2 decimal places
Answer: 109.62cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 12:14:49 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 76, 89, 51, 57, 17, 34, 20, 73. Give your answer to 2 decimal places
Answer: Mean = 56.67, Median = 57, Range = 76