Keystones — Capstone
Five GCSE retrieval questions · 17 July 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √200
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: x² + 2.4x
Answer: (x + 1.2)² - 1.44 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 23cm, angle = 74°
Answer: 154.8cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 3:5. Find a:b:c.
Answer: 9:6:10 -
5. Statistics Averages and range
Find the mean, median and range of: 22, 87, 24, 49, 37, 16, 15, 61, 36
Answer: Mean = 38.6, Median = 36, Range = 72