Cornmeal is the quickest and cheapest way to kill ants. It is safe for the environment, children and pets, and does not attract other pests. Poor little piles of cornmeal near the anthill, the ants will take it home to share. The cornmeal cannot be digested by the ants and they die. It may take a week or so to see the entire colony gone, but it works.
Kill ants and their colonies in just a day. I had thousands of small red ants and large red ones around my front and backyard. Using just a ramekin mixed up 3 batches. Stir well, flip it upside down to avoid wind they were gone.