Keystones — Capstone
Five GCSE retrieval questions · 21 November 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 5√63
Answer: 15√7 -
2. Algebra Completing the square
Complete the square: 3x² + 12x + 11
Answer: 3(x + 2)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 20cm, angle = 53°. Give your answer to 2 decimal places
Answer: 183.69cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 35:45:18 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 64, 68, 28, 26, 70, 89, 50, 55. Give your answer to 2 decimal places
Answer: Mean = 54.56, Median = 55, Range = 63