Read through this explanation of how to add three digit numbers. Use the online game to practice this skill. The game will keep running totals of your correct and incorrect answers. It will also show you a percent score of the correct answers.

This pathway will show you how to use your dashboard to add or create your own content, and how to remix it into customized learning pathways.

Demonstrates how to add and subtract pieces of fruit using the numbers 5 and 3. [2:17]

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

Practice solving word problems by adding and subtracting fractions. The fractions used in these problems have like (common) denominators. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

Sal adds 53+17 by breaking apart the numbers and making a group of 10. [3:35]

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

Sal uses an understanding of place value to add decimals, such as 0.68+0.33. [6:56]

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

Sal simplifies a polynomial addition expression. [2:00]

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

In this feature, adapted from Interactive NOVA: Earth, students explore the relationship between oxygen concentration and the well-being of various organisms by simulating a change in oxygen levels and observing what happens.

A tutorial as an introduction to polynomials. Basic terminology and simple algebraic manipulations. Offers discussions and practice exercises with answers and explanations.

Understanding that when the total number of parts of a whole are the same, fractions can be added.

Students work with a number line and football to model adding and subtracting integers.

This site contains 13 lesson plans that are designed to address that standards of emergent readers. Each lesson engages students in adding or substituting individual sounds (phonemes).

Students play a favorite card game which practices the quick and accurate recall of double facts.

Students use a familiar card game to help them build their math fact fluency for facts where the sum is 10.

How far do I have to walk in order to make 1 mile? Students measure, add, and figure it out.

Can your students make bundles of tens? This lesson allows students to visualize adding tens to make one hundred.

Students learn the basics of 1.OA.1 by mixing addition and subtraction word problems from day 1. The focus question is: Put together or take away?