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PBS
Pbs: Recognize and Represent Proportional Relationships Between Quantities: Ratio, Proportion, Cross Multiply, Divide
In this Cyberchase media gallery, learn about ratio and proportion and how to use an algebraic shortcut to solve proportion problems. In the accompanying classroom activity, students play a game called the "Pom-Pom Nose Push," in which...
Physics Aviary
Physics Aviary: Vector Math
This activity checks that you are able to add and subtract vectors, calculate the dot and cross product of vectors, and multiply or divide vectors by scalars.
Other
Chili Math: Writing and Identifying Equivalent Fractions
Fractions that are the same in value but look different are known as equivalent fractions. As long as you multiply or divide the top and bottom of a fraction by the same nonzero whole number, the resulting fraction will be equivalent to...
Wyzant
Wyzant: Proportions Basics Worksheet
An interactive quiz from WyzAnt of 20 proportions are presented for the students to solve and then check their answers. All can be computed with simple cross-multiplying.
Shmoop University
Shmoop: Fractions & Decimals: Multiplying Fractions and Mixed Numbers
The mathematics resource explores how to multiply fractions and mixed numbers. Students examine the topics through class notes and examples. Practice problems with solutions are available to check for comprehension of the concepts.
Calculator Soup
Calculator Soup: Fractions Solve for Unknown X
Solve for an unknown value x with this fractions calculator. Find the missing fraction variable in the proportion using cross multiplication to calculate the unknown variable x. Solve the proportion between 2 fractions and calculate the...
University of Cambridge
University of Cambridge: Nrich: Game Criss Cross Quiz
Use this online game to improve your subtraction or addition skills while you play on a coordinate plane gameboard. Gain skills in two areas at the same time! This game can also be altered to practice multiplication facts. There is a...
Wolfram Research
Wolfram Math World: Inner Product
This site contains links to four kinds of inner products: Dot Product, Hermitian Inner Product, Interior Product, L2-Inner Product.