Keystones — Capstone
Five GCSE retrieval questions · 29 October 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√160
Answer: 16√10 -
2. Algebra Completing the square
Complete the square: x² - x + 8
Answer: (x - 1⁄2)² + 31⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 13cm, angle = 62°. Give your answer to 2 decimal places
Answer: 143.48cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 14:35:5 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 28, 73, 43, 70, 26, 26, 64, 61. Give your answer to 2 decimal places
Answer: Mean = 52.11, Median = 61, Range = 52