Keystones — Capstone
Five GCSE retrieval questions · 6 August 2019 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √125
Answer: 5√5 -
2. Algebra Completing the square
Complete the square: x² + 5.4x
Answer: (x + 2.7)² - 7.29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 17cm, angle = 70°
Answer: 215.7cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 1:3. Find a:b:c.
Answer: 2:4:12 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 76, 61, 34, 73, 42, 11
Answer: Mean = 46.7, Median = 42, Range = 65