Keystones — Capstone
Five GCSE retrieval questions · 5 August 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √48
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: 3x² + 36x + 10
Answer: 3(x + 6)² - 98 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 19cm, angle = 61°. Give your answer to 2 decimal places
Answer: 216.03cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 16:28:35 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 90, 76, 89, 28, 40, 93. Give your answer to 2 decimal places
Answer: Mean = 61.86, Median = 76, Range = 76