Today in class, we focused on maintaining equality. That means keeping the numbers that you are working on balanced. For example: 85=70+15. If you add 5 to 85, then you have to maintain equality by adding 5 to 70+5, and the numbers will stay equal.
We also worked on problem 3.2, which was about coins and pouches. What we had to do was keep the number of coins per pouch equal, which was maintaining equality. If there were 3 pouches and 2 coins on one side, then you would cross out 3 pouches and 2 coins on the other side too, to keep the number of coins per pouch equal. That is what we worked on today in math class.