Keystones — Capstone
Five GCSE retrieval questions · 30 April 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 - 24x + 9
Answer: 2(x - 6)² - 63 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 14cm, angle = 70°. Give your answer to 2 decimal places
Answer: 98.67cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 12:10:35 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 87, 21, 45, 64, 71, 79. Give your answer to 2 decimal places
Answer: Mean = 65.43, Median = 71, Range = 70