Keystones — Capstone
Five GCSE retrieval questions · 8 January 2019 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: x² + 3.4x
Answer: (x + 1.7)² - 2.89 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 15cm, angle = 55°
Answer: 165.9cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 1:3. Find a:b:c.
Answer: 3:4:12 -
5. Statistics Averages and range
Find the mean, median and range of: 75, 77, 99, 65, 27, 59, 84
Answer: Mean = 69.4, Median = 75, Range = 72