Explains how to add two-digit numbers by focusing on each column of digits as you add, rather than the entire numbers.

Learn how to add double-digit numbers in this lesson complete with examples, rules, and vocabulary.

A complete explanation of complex numbers that includes lessons on adding, subtracting, multiplying, and dividing them, as well as more advanced topics.

In this interactive, use logic to solve riddles involving a wallaby jumping contest. Add two consecutive jumps and place them on a number line, finding equivalent fractions and common denominators to do so. Backward jumps represent...

Practice solving fraction addition and subtraction word problems. The fractions in these problems have unlike denominators. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or...

Canoe Puppies is a multiplayer math game that allows students from anywhere in the world to race against each other while practicing adding two-digit numbers!

This lesson plan uses the book The Very Hungry Caterpillar to teach students to add three numbers to get a sum less than 20.

Learn how to solve two-digit addition problems, and then practice the skill with interactive problems.

The purpose of this task is to support students in developing an understanding of a place value strategy for adding numbers. By using a representation to visualize the abstract notation, students will make sense of the strategy, adding...