Chemically based insecticides are effective, yet they are potentially harmful to all members of the household, especially pets and young children--who not only lie on the floor but also eat things off of it. Many people are using spices to kill ants and other pests. Spices are non-toxic, safer for the family and the environment, and more cost effective than purchasing insecticides.
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Identify where the ants are entering. If possible, remove the host (food items or plants that the ants are living on).
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Spray white vinegar (diluted or full strength) as close to the source as possible. This will disorient the ants and they may not find their way back to your home.
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Stash bay leaves or cloves in silverware drawers and behind countertop appliances.
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Figure out where the ants are getting into your home. Ants are unlikely to cross a barrier of cinnamon, so sprinkle some at their entrance (doors, windows, cracks) to your home. Cinnamon, cayenne, turmeric, black pepper or minced garlic can also be sprinkled on ant hills.
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Place mint (spearmint or peppermint) around windows and doorways. Tea, chewing gum, essential oils or the plants themselves will work. Apparently ants are repelled by the scent.