DoodlePoodle explains today’s lesson, Lesson 3, which builds most especially on Lesson 2, in which your child learned how to mentally calculate the division of something (like money or apples or books) between two people knowing only the total amount and the relative amounts of the total held by each person.
Today your child expands that concept to division of something between three people. As always, the concepts are not really hard and can easily be done mentally. They are a really good way to get your child thinking about the concepts of algebra before facing the added complexity of working out the steps on paper. And practically speaking, these are very helpful skills to have throughout life.