Keystones — Capstone
Five GCSE retrieval questions · 12 July 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √200
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: x² + 2.6x
Answer: (x + 1.3)² - 1.69 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 14cm, angle = 56°
Answer: 110.3cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 4:5. Find a:b:c.
Answer: 8:4:5 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 87, 93, 30, 42, 33, 92, 97, 37
Answer: Mean = 62.8, Median = 54, Range = 67