Keystones — Capstone
Five GCSE retrieval questions · 31 July 2010 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √525
Answer: 5√21 -
2. Algebra Completing the square
Complete the square: 4x² - 24x - 10
Answer: 4(x - 3)² - 46 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 29cm, angle = 61°. Give your answer to 2 decimal places
Answer: 266.32cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 45:40:24 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 45, 62, 14, 59, 81, 84, 26. Give your answer to 2 decimal places
Answer: Mean = 50.88, Median = 52, Range = 70