Keystones — Capstone
Five GCSE retrieval questions · 18 December 2022 · 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 + 5.6x
Answer: (x + 2.8)² - 7.84 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 16cm, angle = 62°
Answer: 120.cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 1:3. Find a:b:c.
Answer: 8:6:18 -
5. Statistics Averages and range
Find the mean, median and range of: 67, 21, 11, 59, 52, 15, 99, 23
Answer: Mean = 43.4, Median = 52, Range = 88