Keystones — Capstone
Five GCSE retrieval questions · 28 May 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √48
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: x² + 7x - 5
Answer: (x + 7⁄2)² - 69⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 14cm, angle = 62°. Give your answer to 2 decimal places
Answer: 98.89cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 18:45:5 -
5. Statistics Averages and range
Find the mean, median and range of: 94, 33, 65, 14, 70, 25, 64, 97, 75. Give your answer to 2 decimal places
Answer: Mean = 59.67, Median = 65, Range = 83