Keystones — Capstone
Five GCSE retrieval questions · 13 August 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 + 5.6x
Answer: (x + 2.8)² - 7.84 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 29cm, angle = 53°
Answer: 196.9cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 1:3. Find a:b:c.
Answer: 4:6:18 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 26, 88, 11, 34, 51, 27
Answer: Mean = 35.6, Median = 27, Range = 77