Keystones — Capstone
Five GCSE retrieval questions · 20 February 2019 · 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 + 3.2x
Answer: (x + 1.6)² - 2.56 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 22cm, angle = 61°
Answer: 134.7cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 3:5. Find a:b:c.
Answer: 2:3:5 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 57, 99, 43, 74, 61, 52, 63
Answer: Mean = 68.1, Median = 63, Range = 56