Now, he solves for an unknown in any position. This video addresses Common Core Grade 2 Standard Operations & Algebraic Thinking: Represent and solve problems involving addition and subtraction.

When you are solving an addition calculation with a two-digit number, you need to think ... The number 17 is made of 1 group of ten and 7 ones. You can show this by putting a pack of 10 pencils ...

In this lesson, students put all their addition and subtraction skills together to solve equations. Julia begins with a number-of-the-day warm up activity, followed by practicing 2 and 3 addition ...

Add a one-digit number (1 through 9) to any two ... and “adding to.” Understand subtraction as “taking apart” and “taking away from.” Understand comparing situations. Solve all of ...