Keystones — Capstone
Five GCSE retrieval questions · 28 June 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √352
Answer: 4√22 -
2. Algebra Completing the square
Complete the square: 3x² + 6x - 1
Answer: 3(x + 1)² - 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 16cm, angle = 77°. Give your answer to 2 decimal places
Answer: 163.69cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 45:18:16 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 46, 43, 30, 15, 96, 97, 53, 39. Give your answer to 2 decimal places
Answer: Mean = 56.67, Median = 46, Range = 82