Keystones — Capstone
Five GCSE retrieval questions · 7 February 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: x² + 4.6x
Answer: (x + 2.3)² - 5.29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 15cm, angle = 64°
Answer: 161.8cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 1:2. Find a:b:c.
Answer: 3:4:8 -
5. Statistics Averages and range
Find the mean, median and range of: 67, 91, 87, 45, 39, 38, 12, 83
Answer: Mean = 57.8, Median = 67, Range = 79