Keystones — Capstone
Five GCSE retrieval questions · 3 August 2011 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: 3x² + 36x + 4
Answer: 3(x + 6)² - 104 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 25cm, angle = 42°. Give your answer to 2 decimal places
Answer: 200.74cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 14:21:3 -
5. Statistics Averages and range
Find the mean, median and range of: 63, 30, 30, 71, 68, 24, 42. Give your answer to 2 decimal places
Answer: Mean = 46.86, Median = 42, Range = 47