Keystones — Capstone
Five GCSE retrieval questions · 30 December 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √704
Answer: 8√11 -
2. Algebra Completing the square
Complete the square: 3x² + 36x - 2
Answer: 3(x + 6)² - 110 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 12cm, angle = 73°. Give your answer to 2 decimal places
Answer: 114.76cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 63:72:64 -
5. Statistics Averages and range
Find the mean, median and range of: 61, 68, 78, 32, 60, 16, 36, 98, 53. Give your answer to 2 decimal places
Answer: Mean = 55.78, Median = 60, Range = 82