Keystones — Capstone
Five GCSE retrieval questions · 21 October 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √700
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: x² - 7x + 8
Answer: (x - 7⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 26cm, angle = 63°. Give your answer to 2 decimal places
Answer: 173.75cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 35:15:24 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 90, 98, 36, 14, 96, 20, 30. Give your answer to 2 decimal places
Answer: Mean = 50.13, Median = 33, Range = 84