Turn everyday activities into fun math practice. If your child is eating waffles for breakfast, see if he can divide a waffle into halves or quarters. Younger children might be able to count the number of waffle grooves while older children might be able to calculate the waffle's circumference.
Like other experienced teachers, I've taught the same concepts and skills to students so many times that I've developed a huge repertoire of activities that I can build into my instructional time. I have activities that provide more scaffolding if the kids didn't really seem to understand the lesson, and activities that will extend student learning if what I taught was too easy. I have activities that will take a long time if my lesson ends early, and activities that can be done quickly if my lesson takes too long.