Keystones — Capstone
Five GCSE retrieval questions · 26 December 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√27
Answer: 15√3 -
2. Algebra Completing the square
Complete the square: 3x² + 12x
Answer: 3(x + 2)² - 12 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 15cm, angle = 54°. Give your answer to 2 decimal places
Answer: 72.81cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 16:10:35 -
5. Statistics Averages and range
Find the mean, median and range of: 75, 84, 14, 98, 26, 24, 37, 64, 52. Give your answer to 2 decimal places
Answer: Mean = 52.67, Median = 52, Range = 84