Jab the area of wall on the right and left sides of each crack with a rigid putty knife. Your goal is to get down to the drywall surface.
Continue in this manner until you create a small valley 3 inches wide on either side of the crack.
Load your tube of caulking into the caulking gun and cover this entire area with a layer of caulk. Pat the caulk down with the putty knife. Allow it to dry overnight.
Dip a 2-inch wide paintbrush into latex primer and apply a light coat of primer to the area. Allow it to dry for five hours.
Spray the area with the spray-on texture that best matches the texture of your walls with a light mist. These cans of spray on texture are designed exactly for small repair jobs like this. Give it 12 full hours to dry.