Keystones — Capstone
Five GCSE retrieval questions · 20 September 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 3√90
Answer: 9√10 -
2. Algebra Completing the square
Complete the square: 5x² + 50x + 12
Answer: 5(x + 5)² - 113 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 21cm, angle = 75°. Give your answer to 2 decimal places
Answer: 141.99cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 3:24:4 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 88, 35, 39, 65, 12, 80. Give your answer to 2 decimal places
Answer: Mean = 56.43, Median = 65, Range = 76