Keystones — Capstone
Five GCSE retrieval questions · 20 June 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √605
Answer: 11√5 -
2. Algebra Completing the square
Complete the square: x² + 5x
Answer: (x + 5⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 30cm, angle = 49°. Give your answer to 2 decimal places
Answer: 316.98cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 9:63:56 -
5. Statistics Averages and range
Find the mean, median and range of: 100, 19, 10, 67, 28, 98, 59. Give your answer to 2 decimal places
Answer: Mean = 54.43, Median = 59, Range = 90