Keystones — Capstone
Five GCSE retrieval questions · 10 January 2019 · 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 + 2.4x
Answer: (x + 1.2)² - 1.44 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 12cm, angle = 65°
Answer: 119.6cm² -
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: 73, 90, 98, 20, 59, 61, 41, 26, 75
Answer: Mean = 60.3, Median = 61, Range = 78