Keystones — Capstone
Five GCSE retrieval questions · 26 April 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 + 3.6x
Answer: (x + 1.8)² - 3.24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 26cm, angle = 57°
Answer: 305.3cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 4:3. Find a:b:c.
Answer: 3:4:3 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 61, 72, 47, 99, 36, 34
Answer: Mean = 57.3, Median = 52, Range = 65