Keystones — Capstone
Five GCSE retrieval questions · 9 February 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √700
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: x² + 3x + 1
Answer: (x + 3⁄2)² - 5⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 24cm, angle = 54°. Give your answer to 2 decimal places
Answer: 252.41cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 27:18:10 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 29, 55, 85, 21, 89, 33. Give your answer to 2 decimal places
Answer: Mean = 48.14, Median = 33, Range = 68