Keystones — Capstone
Five GCSE retrieval questions · 18 March 2022 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √75
Answer: 5√3 -
2. Algebra Completing the square
Complete the square: x² + 4.8x
Answer: (x + 2.4)² - 5.76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 29cm, angle = 48°
Answer: 323.3cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 3:5. Find a:b:c.
Answer: 6:12:20 -
5. Statistics Averages and range
Find the mean, median and range of: 95, 19, 14, 36, 52, 78, 18, 69, 57
Answer: Mean = 48.7, Median = 52, Range = 81