Answer: For converting Canadian Dollars to US Dollars divide 1 by 0.82 to give you an answer of around 1.2195(repeating). Then multiply that number by each of the Canadian Dollar amounts. US Dollars to Canadian Dollars is much simpler, as you just multiply the amount by 0.82 to find the answer.
$1.45 CAD x 1.2195 = $1.77 USD
$45.5 USD x 0.82 = $38.31 CAD
$2.50 CAD x 1.2195 = $3.05 USD
$1,500 CAD x 1.2195 = $1,829.27 USD
Hope this helped, and have a great day!