Keystones — Capstone
Five GCSE retrieval questions · 24 March 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√48
Answer: 20√3 -
2. Algebra Completing the square
Complete the square: 3x² + 18x - 14
Answer: 3(x + 3)² - 41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 27cm, angle = 72°. Give your answer to 2 decimal places
Answer: 320.98cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 12:28:49 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 86, 24, 90, 26, 42, 21, 74. Give your answer to 2 decimal places
Answer: Mean = 56.13, Median = 58, Range = 69