Keystones — Capstone
Five GCSE retrieval questions · 17 May 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 + 4x
Answer: (x + 2)² - 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 17cm, angle = 75°
Answer: 180.6cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:3. Find a:b:c.
Answer: 4:6:9 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 53, 37, 79, 73, 17, 25, 34
Answer: Mean = 50.4, Median = 53, Range = 68