Keystones — Capstone
Five GCSE retrieval questions · 21 August 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: x² + 3.4x
Answer: (x + 1.7)² - 2.89 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 27cm, angle = 44°
Answer: 140.7cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 1:2. Find a:b:c.
Answer: 12:6:12 -
5. Statistics Averages and range
Find the mean, median and range of: 42, 71, 20, 91, 41, 36, 37, 86, 48
Answer: Mean = 52.4, Median = 42, Range = 71