Keystones — Capstone
Five GCSE retrieval questions · 14 September 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √125
Answer: 5√5 -
2. Algebra Completing the square
Complete the square: 4x² + 40x + 3
Answer: 4(x + 5)² - 97 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 24cm, angle = 74°. Give your answer to 2 decimal places
Answer: 346.05cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 27:45:20 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 41, 96, 47, 53, 43, 54. Give your answer to 2 decimal places
Answer: Mean = 50.14, Median = 47, Range = 79