Two-digit Addition and Subtraction

Help your class discover the commutative property of addition with this exploration of the addition table. By folding and coloring the table, a symmetry is found that directs students to an understanding of this crucial mathematical...

In this math worksheet, students will work with a coach to solve a story problem in which they must add three-digit numbers. Students will follow a step-by-step process and notes are provided for the coach.

Hop your way through a mathematical equation with your first grade class as they learn the idea of moving up and down the number line. Adding and subtracting like little frogs is an engaging and clever way to teach/reinforce this concept.

Zoe needs to back up her music collection, but do her friends have enough space on their computers to help? Find out as you teach your class how to add two- and three-digit numbers with regrouping. Place value is emphasized as both the...

Understanding the inverse relationship between addition and subtraction is essential for developing fluency in young mathematicians. Zoe and RJ explain how three numbers can form fact families that make two addition and two subtraction...

In this video, students are introduced to the concept of fact families. Visual models are used to show how one addition fact yields two subtraction facts. They are then presented with some true or false questions and word problems. [8:44]

Sal adds and subtracts three-digit numbers less than 1000 using a number line. Includes a video, transcript, and question and answer section. [2:24]

Learn about addition in this fun clip from the Odd Squad. Agent Otto joins Soundcheck for their new hit song, "Gonna Add One".

Developing fluency with basic addition and subtraction is fundamental to the success of all young mathematicians. This four-day lesson series begins with learners using ten-frames and hundreds charts to recognize patterns when adding and...

Teach your class how to mentally solve whole number addition and subtraction problems using compensation from tidy numbers including equal additions. They use appropriate recording techniques and predict the usefulness of strategies for...