Keystones — Capstone
Five GCSE retrieval questions · 28 August 2012 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √550
Answer: 5√22 -
2. Algebra Completing the square
Complete the square: 5x² - 60x - 11
Answer: 5(x - 6)² - 191 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 17cm, angle = 57°. Give your answer to 2 decimal places
Answer: 163.96cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 81:36:16 -
5. Statistics Averages and range
Find the mean, median and range of: 16, 20, 24, 66, 20, 24, 88. Give your answer to 2 decimal places
Answer: Mean = 36.86, Median = 24, Range = 72