Curated OER
Solving Equations
How do you solve a problem when a symbol or letter is used in place of a missing number? Build algebraic reasoning and problem solving skills with this presentation that explains three methods for finding a missing variable. The guess...
Curated OER
Making Ten
Provide learners with both the questions and the answers at the same time. They will consider each problem and then read how to solve it. There are two problems in which they are required to make 10 by completing the steps found in each...
Texas Instruments
Texas Instruments: Using the Equation Solver to Find a Solution
In this tutorial, you will see how to use the Equation Solver (under the MATH) key to find the value of a missing variable in an equation.
National Council of Teachers of Mathematics
Nctm: Figure This: Which Is Worth More, a Smile or a Frown?
Solve for the value of the smiles and frowns to find out how much a smile is worth, in this activity. A challenge that focuses on number sense, number combinations, and unknowns. Included are examples of how this skill is applied in real...