Keystones — Capstone
Five GCSE retrieval questions · 17 April 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² + 9x + 9
Answer: (x + 9⁄2)² - 45⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 24cm, angle = 47°. Give your answer to 2 decimal places
Answer: 122.87cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 42:35:25 -
5. Statistics Averages and range
Find the mean, median and range of: 22, 64, 60, 44, 64, 37, 78, 92. Give your answer to 2 decimal places
Answer: Mean = 57.63, Median = 62, Range = 70