Keystones — Capstone
Five GCSE retrieval questions · 5 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 + 5.8x
Answer: (x + 2.9)² - 8.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 22cm, angle = 46°
Answer: 118.7cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 2:5. Find a:b:c.
Answer: 2:4:10 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 75, 66, 79, 87, 46, 49, 75
Answer: Mean = 68.8, Median = 75, Range = 41