Keystones — Capstone
Five GCSE retrieval questions · 6 December 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √108
Answer: 6√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 = 14cm, b = 12cm, angle = 53°
Answer: 67.cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 2:5. Find a:b:c.
Answer: 2:4:10 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 81, 35, 77, 61, 74, 21
Answer: Mean = 54.6, Median = 61, Range = 60