No, no, no...
What you do with them depends on the terms of your credit card with respect to using those checks. Many credit cards have clauses which jack credit transferences into higher-rate categories, but the options vary significantly.
It's best to shop around. Develop a spreadsheet for accurately comparing options. Even the most complicated financial equations are less complicated than those for Physics :).
Read the fine print, and pick the best set of solutions that will result in the lowest overall annual interest cost.
If you pay your credit card in full with room to spare, there's little reason why you need a credit card at all. It's nice for those once in a while purchases beyond your cash means to float it, but if you have the case and you're not clearing net, well above market, just pay cash. Or pay credit and pay off credit.