Keystones — Capstone
Five GCSE retrieval questions · 30 September 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √384
Answer: 8√6 -
2. Algebra Completing the square
Complete the square: x² + 7x + 2
Answer: (x + 7⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 18cm, angle = 57°. Give your answer to 2 decimal places
Answer: 158.51cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 40:35:42 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 52, 14, 92, 94, 95, 40
Answer: Mean = 69, Median = 92, Range = 82