What is matter? Do your kids know what matter is, and can they explain it to your satisfaction? Teach your kids that matter is anything that has weight and occupies space. This means that matter is everything. Give your kids some common examples of matter such as people, animals, objects, and even liquids. Now, look at the levels of matter in this worksheet. Ask your kids to solve the mathematical problems beneath them by circling the number that completes the number sentence.