Keystones — Capstone
Five GCSE retrieval questions · 23 December 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√45
Answer: 9√5 -
2. Algebra Completing the square
Complete the square: x² - 11x + 7
Answer: (x - 11⁄2)² - 93⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 30cm, angle = 74°. Give your answer to 2 decimal places
Answer: 273.96cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 35:14:18 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 49, 43, 11, 12, 62, 98, 85
Answer: Mean = 46.5, Median = 46, Range = 87