Keystones — Capstone
Five GCSE retrieval questions · 25 December 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² + 6x
Answer: (x + 3)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 29cm, angle = 47°
Answer: 127.3cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 2:3. Find a:b:c.
Answer: 2:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 67, 65, 32, 93, 78, 95, 68, 75
Answer: Mean = 71.6, Median = 75, Range = 63