Keystones — Capstone
Five GCSE retrieval questions · 3 July 2018 · 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 + 4.6x
Answer: (x + 2.3)² - 5.29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 17cm, angle = 57°
Answer: 106.9cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 1:2. Find a:b:c.
Answer: 6:12:24 -
5. Statistics Averages and range
Find the mean, median and range of: 22, 92, 88, 12, 38, 46, 94, 47
Answer: Mean = 54.9, Median = 47, Range = 82