Keystones — Capstone
Five GCSE retrieval questions · 10 October 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√45
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: 2x² + 24x + 7
Answer: 2(x + 6)² - 65 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 30cm, angle = 48°. Give your answer to 2 decimal places
Answer: 312.12cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 20:36:63 -
5. Statistics Averages and range
Find the mean, median and range of: 53, 95, 89, 53, 38, 98, 65. Give your answer to 2 decimal places
Answer: Mean = 70.14, Median = 65, Range = 60