Keystones — Capstone
Five GCSE retrieval questions · 2 September 2020 · 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 + 2.2x
Answer: (x + 1.1)² - 1.21 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 28cm, angle = 46°
Answer: 161.cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 2:3. Find a:b:c.
Answer: 8:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 92, 39, 100, 39, 14, 35, 42, 24, 61
Answer: Mean = 49.6, Median = 39, Range = 86