Keystones — Capstone
Five GCSE retrieval questions · 3 October 2019 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √363
Answer: 11√3 -
2. Algebra Completing the square
Complete the square: x² + 5.8x
Answer: (x + 2.9)² - 8.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 19cm, angle = 72°
Answer: 180.7cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 3:5. Find a:b:c.
Answer: 12:6:10 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 47, 37, 14, 88, 34, 31, 31
Answer: Mean = 36.9, Median = 34, Range = 75