Keystones — Capstone
Five GCSE retrieval questions · 3 July 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √475
Answer: 5√19 -
2. Algebra Completing the square
Complete the square: x² + 9x + 5
Answer: (x + 9⁄2)² - 61⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 25cm, angle = 69°. Give your answer to 2 decimal places
Answer: 245.06cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 16:40:45 -
5. Statistics Averages and range
Find the mean, median and range of: 37, 75, 41, 38, 98, 56, 53, 88
Answer: Mean = 60.75, Median = 54.5, Range = 61