Keystones — Capstone
Five GCSE retrieval questions · 26 February 2019 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² + 3x
Answer: (x + 1.5)² - 2.25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 28cm, angle = 73°
Answer: 254.4cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 1:2. Find a:b:c.
Answer: 2:4:8 -
5. Statistics Averages and range
Find the mean, median and range of: 98, 56, 42, 39, 26, 77, 62, 85
Answer: Mean = 60.6, Median = 62, Range = 72