Keystones — Capstone
Five GCSE retrieval questions · 16 January 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√63
Answer: 12√7 -
2. Algebra Completing the square
Complete the square: x² + 5x - 7
Answer: (x + 5⁄2)² - 53⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 29cm, angle = 56°. Give your answer to 2 decimal places
Answer: 192.34cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 24:30:25 -
5. Statistics Averages and range
Find the mean, median and range of: 66, 29, 21, 20, 83, 93, 62. Give your answer to 2 decimal places
Answer: Mean = 53.43, Median = 62, Range = 73