Keystones — Capstone
Five GCSE retrieval questions · 6 March 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √216
Answer: 6√6 -
2. Algebra Completing the square
Complete the square: 4x² - 8x + 6
Answer: 4(x - 1)² + 2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 27cm, angle = 42°. Give your answer to 2 decimal places
Answer: 243.9cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 36:28:49 -
5. Statistics Averages and range
Find the mean, median and range of: 99, 18, 27, 38, 45, 88, 23, 51. Give your answer to 2 decimal places
Answer: Mean = 48.63, Median = 41.5, Range = 81