Keystones — Capstone
Five GCSE retrieval questions · 1 January 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √600
Answer: 10√6 -
2. Algebra Completing the square
Complete the square: x² + 11x - 1
Answer: (x + 11⁄2)² - 125⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 26cm, angle = 63°. Give your answer to 2 decimal places
Answer: 347.49cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 10:45:81 -
5. Statistics Averages and range
Find the mean, median and range of: 10, 100, 52, 34, 84, 28, 35, 61, 24. Give your answer to 2 decimal places
Answer: Mean = 47.56, Median = 35, Range = 90