Keystones — Capstone
Five GCSE retrieval questions · 24 September 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√48
Answer: 16√3 -
2. Algebra Completing the square
Complete the square: 4x² + 48x + 12
Answer: 4(x + 6)² - 132 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 17cm, angle = 80°. Give your answer to 2 decimal places
Answer: 234.38cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 2:10:5 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 39, 12, 68, 97, 98, 13. Give your answer to 2 decimal places
Answer: Mean = 48.86, Median = 39, Range = 86