Keystones — Capstone
Five GCSE retrieval questions · 26 January 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: x² + 5.2x
Answer: (x + 2.6)² - 6.76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 13cm, angle = 66°
Answer: 160.3cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 2:5. Find a:b:c.
Answer: 4:2:5 -
5. Statistics Averages and range
Find the mean, median and range of: 67, 72, 65, 26, 98, 56, 50
Answer: Mean = 62, Median = 65, Range = 72