Keystones — Capstone
Five GCSE retrieval questions · 19 October 2011 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 2√12
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: 2x² - 4x - 1
Answer: 2(x - 1)² - 3 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 15cm, angle = 71°. Give your answer to 2 decimal places
Answer: 99.28cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 12:10:45 -
5. Statistics Averages and range
Find the mean, median and range of: 88, 17, 76, 67, 52, 68, 95, 22, 74. Give your answer to 2 decimal places
Answer: Mean = 62.11, Median = 68, Range = 78