Keystones — Capstone
Five GCSE retrieval questions · 15 January 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√75
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: 4x² + 32x - 6
Answer: 4(x + 4)² - 70 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 21cm, angle = 56°. Give your answer to 2 decimal places
Answer: 139.28cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 32:12:27 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 35, 56, 50, 64, 42, 43, 83. Give your answer to 2 decimal places
Answer: Mean = 49.88, Median = 46.5, Range = 57