Keystones — Capstone
Five GCSE retrieval questions · 20 April 2016 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 4√150
Answer: 20√6 -
2. Algebra Completing the square
Complete the square: x² + 5x + 5
Answer: (x + 5⁄2)² - 5⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 26cm, angle = 69°. Give your answer to 2 decimal places
Answer: 169.91cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 24:15:25 -
5. Statistics Averages and range
Find the mean, median and range of: 57, 54, 100, 82, 92, 68, 32. Give your answer to 2 decimal places
Answer: Mean = 69.29, Median = 68, Range = 68