Keystones — Capstone
Five GCSE retrieval questions · 7 April 2018 · 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 + 2x
Answer: (x + 1)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 21cm, angle = 79°
Answer: 164.9cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 2:3. Find a:b:c.
Answer: 2:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 95, 83, 98, 69, 60, 39, 21
Answer: Mean = 67.6, Median = 76, Range = 77