Keystones — Capstone
Five GCSE retrieval questions · 5 February 2012 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √240
Answer: 4√15 -
2. Algebra Completing the square
Complete the square: 4x² - 32x - 12
Answer: 4(x - 4)² - 76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 25cm, angle = 50°. Give your answer to 2 decimal places
Answer: 143.63cm² -
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: 24, 14, 73, 38, 48, 42, 81. Give your answer to 2 decimal places
Answer: Mean = 45.71, Median = 42, Range = 67