Keystones — Capstone
Five GCSE retrieval questions · 5 January 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² + 2x
Answer: (x + 1)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 20cm, angle = 56°
Answer: 174.cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 2:3. Find a:b:c.
Answer: 6:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 52, 98, 76, 29, 56, 75
Answer: Mean = 61.9, Median = 56, Range = 69