Keystones — Capstone
Five GCSE retrieval questions · 23 December 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 + 2.2x
Answer: (x + 1.1)² - 1.21 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 30cm, angle = 54°
Answer: 351.9cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 2:3. Find a:b:c.
Answer: 8:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 81, 41, 24, 64, 89, 58, 48, 31
Answer: Mean = 54.5, Median = 58, Range = 65