Keystones — Capstone
Five GCSE retrieval questions · 4 December 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√12
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: 4x² + 8x + 5
Answer: 4(x + 1)² + 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 30cm, angle = 72°. Give your answer to 2 decimal places
Answer: 399.44cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 72:63:7 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 18, 56, 37, 51, 52, 19. Give your answer to 2 decimal places
Answer: Mean = 44.43, Median = 51, Range = 60