Keystones — Capstone
Five GCSE retrieval questions · 5 December 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² + 2.8x
Answer: (x + 1.4)² - 1.96 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 14cm, angle = 57°
Answer: 111.5cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 3:4. Find a:b:c.
Answer: 9:6:8 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 76, 22, 33, 83, 92, 42, 67, 86
Answer: Mean = 61.4, Median = 67, Range = 70