Keystones — Capstone
Five GCSE retrieval questions · 16 March 2022 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√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 = 12cm, b = 27cm, angle = 57°
Answer: 135.9cm² -
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: 19, 57, 79, 56, 19, 42, 11
Answer: Mean = 40.4, Median = 42, Range = 68