Keystones — Capstone
Five GCSE retrieval questions · 24 September 2020 · 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 + 3.6x
Answer: (x + 1.8)² - 3.24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 14cm, angle = 61°
Answer: 140.8cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 2:3. Find a:b:c.
Answer: 8:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 42, 40, 35, 89, 52, 62, 94, 88
Answer: Mean = 62.8, Median = 62, Range = 59