Keystones — Capstone
Five GCSE retrieval questions · 23 September 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 + 2.4x
Answer: (x + 1.2)² - 1.44 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 24cm, angle = 78°
Answer: 140.9cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 2:3. Find a:b:c.
Answer: 2:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 94, 20, 97, 93, 10, 100, 77, 71
Answer: Mean = 72.6, Median = 91, Range = 90