Question

What is 2 1/2 of 84?

Answer 1

2 1/2 × 84
5/2 × 84
210

Answer 2

$2\frac{1}{2}\ of\ 84=2\frac{1}{2}\times84\\\\\#1\\2\frac{1}{2}=\frac{2\times2+1}{2}=\frac{5}{2}\\\\therefore\ 2\frac{1}{2}\ of\ 84=\frac{5}{2}\times84=\frac{5}{\not2_1}\times\frac{\not84^{42}}{1}=5\times42=\boxed{210}\\\\\#2\\2\frac{1}{2}=2.5\\\\therefore\ 2\frac{1}{2}\ of\ 84=2.5\times84=\boxed{210}$