Keystones — Capstone
Five GCSE retrieval questions · 16 December 2022 · 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 + 2.8x
Answer: (x + 1.4)² - 1.96 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 22cm, angle = 58°
Answer: 261.2cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 4:3. Find a:b:c.
Answer: 2:4:3 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 37, 88, 81, 40, 56, 33, 93
Answer: Mean = 60.5, Median = 56, Range = 60