Keystones — Capstone
Five GCSE retrieval questions · 5 February 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √208
Answer: 4√13 -
2. Algebra Completing the square
Complete the square: x² + 7x + 12
Answer: (x + 7⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 16cm, angle = 49°. Give your answer to 2 decimal places
Answer: 181.13cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 10:45:63 -
5. Statistics Averages and range
Find the mean, median and range of: 71, 50, 68, 89, 87, 51, 36. Give your answer to 2 decimal places
Answer: Mean = 64.57, Median = 68, Range = 53