Keystones — Capstone
Five GCSE retrieval questions · 6 January 2022 · 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 + 4.2x
Answer: (x + 2.1)² - 4.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 20cm, angle = 56°
Answer: 140.9cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 1:2. Find a:b:c.
Answer: 2:4:8 -
5. Statistics Averages and range
Find the mean, median and range of: 95, 84, 52, 97, 95, 16, 25, 28
Answer: Mean = 61.5, Median = 84, Range = 81