Keystones — Capstone
Five GCSE retrieval questions · 19 March 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√112
Answer: 20√7 -
2. Algebra Completing the square
Complete the square: 2x² + 12x - 4
Answer: 2(x + 3)² - 22 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 23cm, angle = 65°. Give your answer to 2 decimal places
Answer: 208.45cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 8:72:9 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 65, 56, 55, 46, 99, 60, 32. Give your answer to 2 decimal places
Answer: Mean = 61.63, Median = 58, Range = 67