Keystones — Capstone
Five GCSE retrieval questions · 18 December 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √242
Answer: 11√2 -
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 = 29cm, b = 24cm, angle = 50°
Answer: 266.6cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 2:3. Find a:b:c.
Answer: 3:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 45, 42, 57, 62, 74, 43, 74
Answer: Mean = 60.1, Median = 62, Range = 42