Keystones — Capstone
Five GCSE retrieval questions · 1 March 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
2. Algebra Completing the square
Complete the square: x² + 3.4x
Answer: (x + 1.7)² - 2.89 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 25cm, angle = 78°
Answer: 281.2cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 1:2. Find a:b:c.
Answer: 4:2:4 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 62, 37, 67, 71, 46, 56, 99
Answer: Mean = 64.8, Median = 67, Range = 62