Make sure you clear debt from high interest rate cards because the higher rates make it harder and more costly for you to carry it. (moneysense.ca)
Bottom line: balances on high interest rate card accumulate incredibly quickly, so kill them first one at a time. (money.stackexchange.com)
You may be eligible for a 0 % promo rate, which will provide you with more time to pay off the balance and allow you to focus on other high interest rate cards. (wisebread.com)