Keystones — Capstone
Five GCSE retrieval questions · 8 January 2015 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 4√160
Answer: 16√10 -
2. Algebra Completing the square
Complete the square: 2x² - 20x - 8
Answer: 2(x - 5)² - 58 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 29cm, angle = 70°. Give your answer to 2 decimal places
Answer: 381.52cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 4:10:5 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 11, 43, 75, 90, 90, 100, 88
Answer: Mean = 72, Median = 83.5, Range = 89