Keystones — Capstone
Five GCSE retrieval questions · 9 June 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² + 2.6x
Answer: (x + 1.3)² - 1.69 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 30cm, angle = 46°
Answer: 161.9cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 4:5. Find a:b:c.
Answer: 16:12:15 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 35, 84, 25, 62, 31, 39, 80, 52
Answer: Mean = 54.9, Median = 52, Range = 61