Keystones — Capstone
Five GCSE retrieval questions · 22 June 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² - 3x + 1
Answer: (x - 3⁄2)² - 5⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 20cm, angle = 57°. Give your answer to 2 decimal places
Answer: 167.73cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 16:10:25 -
5. Statistics Averages and range
Find the mean, median and range of: 99, 38, 97, 30, 74, 55, 70, 95
Answer: Mean = 69.75, Median = 72, Range = 69