Khan Academy
Khan Academy: Manipulate Expressions Using Structure
Rewrite an expression containing two unknown variables by using a given equation that contains those variables.
BBC
Bbc: Manipulation of Aglebraic Expressions
Pick up some valuable pointers on how to simplify and factor algebraic expressions. When you finish working your way through the pages, you can take an online "Test Bite" and check your understanding.
Illustrative Mathematics
Illustrative Mathematics: A Sse Sum of Even and Odd
In this task, young scholars use the structure of an expression to find ways to rewrite it. They are asked to use the defining property of even and odd functions to manipulate expressions involving function notation and to see the...
Scholastic
Scholastic: Solving the Unknown With Algebra
Young scholars will learn and reinforce skills for solving for unknowns, manipulating equations while keeping them in balance, using formulas to solve real-world challenges, and working with proportions, radicals and exponents.