Keystones — Capstone
Five GCSE retrieval questions · 29 November 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
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 = 28cm, b = 15cm, angle = 43°
Answer: 143.2cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 2:3. Find a:b:c.
Answer: 3:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 67, 21, 19, 65, 91, 98, 51, 78, 24
Answer: Mean = 57.1, Median = 65, Range = 79