Keystones — Capstone
Five GCSE retrieval questions · 28 September 2010 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: 3x² + 6x + 9
Answer: 3(x + 1)² + 6 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 25cm, angle = 40°. Give your answer to 2 decimal places
Answer: 168.73cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 21:18:8 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 38, 72, 76, 39, 13, 70, 79. Give your answer to 2 decimal places
Answer: Mean = 50.88, Median = 54.5, Range = 66