Keystones — Capstone
Five GCSE retrieval questions · 28 January 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√112
Answer: 20√7 -
2. Algebra Completing the square
Complete the square: x² + 11x + 2
Answer: (x + 11⁄2)² - 113⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 13cm, angle = 47°. Give your answer to 2 decimal places
Answer: 133.11cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 8:36:45 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 65, 92, 74, 59, 78, 67. Give your answer to 2 decimal places
Answer: Mean = 73.29, Median = 74, Range = 33