Keystones — Capstone
Five GCSE retrieval questions · 17 December 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: 3x² - 36x - 8
Answer: 3(x - 6)² - 116 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 16cm, angle = 79°. Give your answer to 2 decimal places
Answer: 125.65cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 40:56:21 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 76, 49, 83, 36, 81, 48. Give your answer to 2 decimal places
Answer: Mean = 57.43, Median = 49, Range = 54