Keystones — Capstone
Five GCSE retrieval questions · 19 June 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 + 3.4x
Answer: (x + 1.7)² - 2.89 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 29cm, angle = 76°
Answer: 239.2cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 2:3. Find a:b:c.
Answer: 8:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 22, 77, 65, 71, 27, 31, 88
Answer: Mean = 58.4, Median = 71, Range = 66