Keystones — Capstone
Five GCSE retrieval questions · 21 February 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 + 5.2x
Answer: (x + 2.6)² - 6.76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 27cm, angle = 41°
Answer: 230.3cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:5. Find a:b:c.
Answer: 8:6:15 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 68, 29, 16, 63, 16, 39
Answer: Mean = 35, Median = 29, Range = 54