Keystones — Capstone
Five GCSE retrieval questions · 22 November 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 2√44
Answer: 4√11 -
2. Algebra Completing the square
Complete the square: x² - 9x - 1
Answer: (x - 9⁄2)² - 85⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 16cm, angle = 40°. Give your answer to 2 decimal places
Answer: 61.71cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 45:20:4 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 61, 19, 48, 96, 41, 80. Give your answer to 2 decimal places
Answer: Mean = 51.43, Median = 48, Range = 81