Keystones — Capstone
Five GCSE retrieval questions · 29 September 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: x² + 6x
Answer: (x + 3)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 24cm, angle = 71°
Answer: 295cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 1:2. Find a:b:c.
Answer: 2:4:8 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 96, 49, 69, 47, 37, 78
Answer: Mean = 61.4, Median = 54, Range = 59