Keystones — Capstone
Five GCSE retrieval questions · 16 February 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √75
Answer: 5√3 -
2. Algebra Completing the square
Complete the square: x² + 2.8x
Answer: (x + 1.4)² - 1.96 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 30cm, angle = 40°
Answer: 279.6cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:3. Find a:b:c.
Answer: 16:12:18 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 43, 60, 37, 39, 62, 48
Answer: Mean = 54.3, Median = 48, Range = 54