Ways to break apart numbers to solve addition & subtraction equations in a fact family. In this lesson, Julia reviews the ways to make 10 and how we can use these ways to break apart numbers to solve ...

Problems are often answered in mathematics by solving equations. We use letters to represent an unknown number or value. To solve an equation, we need to find what number the letter in the equation ...

A function machine is a way of writing rules using a flow diagram. The equation \(3j - 6 = 9\) can be shown on a function machine by writing out the functions that have been applied to \(j\) in the ...

Students put all of their addition and subtraction skills together to solve equations. In this lesson, students put all of their addition and subtraction skills together to solve equations. Julia ...

Grade school math students are likely familiar with teachers admonishing them not to just guess the answer to a problem. But a new proof establishes that, in fact, the right kind of guessing is ...