Keystones — Capstone
Five GCSE retrieval questions · 18 June 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√20
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: 3x² - 6x
Answer: 3(x - 1)² - 3 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 19cm, angle = 41°. Give your answer to 2 decimal places
Answer: 81.02cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 16:20:45 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 86, 12, 63, 100, 51, 89. Give your answer to 2 decimal places
Answer: Mean = 71.14, Median = 86, Range = 88