Keystones — Capstone
Five GCSE retrieval questions · 5 August 2012 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 3√28
Answer: 6√7 -
2. Algebra Completing the square
Complete the square: 2x² + 4x - 3
Answer: 2(x + 1)² - 5 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 21cm, angle = 57°. Give your answer to 2 decimal places
Answer: 237.76cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 49:63:72 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 81, 12, 38, 55, 48, 80, 27. Give your answer to 2 decimal places
Answer: Mean = 45.63, Median = 43, Range = 69