Keystones — Capstone
Five GCSE retrieval questions · 17 February 2011 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: 4x² + 48x - 2
Answer: 4(x + 6)² - 146 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 19cm, angle = 45°. Give your answer to 2 decimal places
Answer: 100.76cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 45:35:63 -
5. Statistics Averages and range
Find the mean, median and range of: 94, 21, 84, 47, 79, 68, 91, 15. Give your answer to 2 decimal places
Answer: Mean = 62.38, Median = 73.5, Range = 79