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

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...

An interactive simulation that teaches about equivalent, evaluating, and simplifying expressions through games and exercises building coin expressions. This simulation can either be downloaded or played online and includes handouts,...

Use this calculator to add, subtract, multiply and divide numbers in scientific notation, E notation, or engineering notation. Answers are provided in three formats: scientific notation, E notation, and engineering notation.