Keystones — Capstone
Five GCSE retrieval questions · 19 September 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √250
Answer: 5√10 -
2. Algebra Completing the square
Complete the square: x² + 3x - 3
Answer: (x + 3⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 14cm, angle = 61°. Give your answer to 2 decimal places
Answer: 122.45cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 21:14:16 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 49, 27, 76, 72, 50, 11. Give your answer to 2 decimal places
Answer: Mean = 45.86, Median = 49, Range = 65