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Khan Academy
Khan Academy: Add and Subtract Fractions Word Problems
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...
PBS
Pbs Learning Media: The Number Line: Rational Numbers and Football
Students add and subtract plays on a football field to practice working with negative and positive integers on the number line.
PBS
Pbs: The Number Line: Rational Numbers and Football
In this interactive, students add and subtract plays on a football field to practice working with negative and positive integers on the number line. Each set of randomized drives consists of seven to nine plays and ends with a touchdown....
University of Texas
Inside Mathematics: Pocket Money [Pdf]
This task challenges a student to demonstrate fluency in adding and subtracting whole numbers.
Johan Claeys
Math Abundance: An Introduction to Complex Numbers
A complete explanation of complex numbers that includes lessons on adding, subtracting, multiplying, and dividing them, as well as more advanced topics.
Illustrative Mathematics
Illustrative Mathematics: 7.ns Distances on the Number Line 2
In this lesson, 7th graders add and subtract rational numbers on a number line.
Intel Corporation
Intel: Fractions Made Visual
Students learn the importance of math accuracy and, more specifically, that knowing how to add, subtract, multiply, and divide fractions make life easier for everyone. To help students come to this understanding, they are assigned to a...
Calculator Soup
Calculator Soup: Scientific Notation Calculator
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.
Illustrative Mathematics
Illustrative Mathematics: The Value of Education
The purpose of this task is for students to add, subtract, multiply, and divide decimal numbers in a real-world context. The weekly income earned by each person in the task is the median weekly income for their education level, but they...