Keystones — Capstone
Five GCSE retrieval questions · 17 September 2022 · 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 + 4.6x
Answer: (x + 2.3)² - 5.29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 12cm, angle = 70°
Answer: 152.2cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 3:5. Find a:b:c.
Answer: 12:6:10 -
5. Statistics Averages and range
Find the mean, median and range of: 45, 56, 45, 20, 10, 73, 84, 58
Answer: Mean = 48.9, Median = 56, Range = 74