Keystones — Capstone
Five GCSE retrieval questions · 28 November 2017 · 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 + 7x + 3
Answer: (x + 7⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 29cm, angle = 51°. Give your answer to 2 decimal places
Answer: 292.98cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 7:28:32 -
5. Statistics Averages and range
Find the mean, median and range of: 44, 73, 21, 32, 63, 83, 18, 17, 29. Give your answer to 2 decimal places
Answer: Mean = 42.22, Median = 32, Range = 66