Keystones — Capstone
Five GCSE retrieval questions · 19 March 2012 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √275
Answer: 5√11 -
2. Algebra Completing the square
Complete the square: 3x² + 36x - 1
Answer: 3(x + 6)² - 109 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 12cm, angle = 42°. Give your answer to 2 decimal places
Answer: 92.34cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 3:18:4 -
5. Statistics Averages and range
Find the mean, median and range of: 57, 89, 90, 83, 61, 34, 28, 93. Give your answer to 2 decimal places
Answer: Mean = 66.88, Median = 72, Range = 65