Keystones — Capstone
Five GCSE retrieval questions · 27 May 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √700
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: 2x² + 4x - 9
Answer: 2(x + 1)² - 11 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 20cm, angle = 41°. Give your answer to 2 decimal places
Answer: 104.97cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 56:24:21 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 52, 100, 96, 92, 15, 89, 12, 40. Give your answer to 2 decimal places
Answer: Mean = 63.78, Median = 78, Range = 88