Keystones — Capstone
Five GCSE retrieval questions · 22 March 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 4√27
Answer: 12√3 -
2. Algebra Completing the square
Complete the square: x² - 5x + 1
Answer: (x - 5⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 29cm, angle = 64°. Give your answer to 2 decimal places
Answer: 195.49cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 63:45:5 -
5. Statistics Averages and range
Find the mean, median and range of: 89, 89, 95, 50, 98, 28, 85. Give your answer to 2 decimal places
Answer: Mean = 76.29, Median = 89, Range = 70