https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-expressions-and-variables/cc-7th-evaluating-expressions-word-problems/v/evaluate-a-formula-using-substitution 2021-06-30T17:51:06Z Evaluating expressions with variables: temperature In this example we have a formula for converting Celsius temperature to Fahrenheit. Let's substitute the variable with a value (Celsius temp) to get the degrees in Fahrenheit. Great problem to practice with us! Sal Khan video https://cdn.kastatic.org/googleusercontent/berneDrmbVmpp3eBuZn-mtURjYdLV3K8ovSZ6o5a8NdNWQjjWcEc36yJ_bLnf3jhxnMelCY8PxMieual5SwiM5E Evaluating expressions with variables: temperature In this example we have a formula for converting Celsius temperature to Fahrenheit. Let's substitute the variable with a value (Celsius temp) to get the degrees in Fahrenheit. Great problem to practice with us! https://cdn.kastatic.org/ka-youtube-converted/tC1SfxRvtmM.mp4/tC1SfxRvtmM.mp4 75 Evaluating expressions word problems https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-expressions-and-variables/cc-7th-evaluating-expressions-word-problems/a/evaluating-expressions-with-variables-in-word-problems 2021-06-30T17:51:07Z Evaluating expressions with variables word problems Learn to evaluate expressions in word problems to gain new information.  article https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-expressions-and-variables/cc-7th-evaluating-expressions-word-problems/e/evaluating-expressions-3 2026-04-07T23:36:17.218592739Z Evaluating expressions with variables word problems Practice plugging in values to evaluate real-world algebraic expressions. These are introductory problems, so the expressions aren't too complicated. ivan.savov exercise https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-expressions-and-variables/cc-7th-evaluating-expressions-word-problems/v/evaluating-expressions-3-exercise 2023-06-30T02:13:42.781179102Z Evaluating expressions with variables: cubes Discover how to calculate the total surface area of cube-shaped containers with varying side lengths. Learn the formula 6x², where x represents the side length of a cube. Apply this formula to find the surface area of multiple cubes, and add the results to determine the combined surface area that needs painting. Sal Khan video https://cdn.kastatic.org/googleusercontent/_mez5zC_Y7YgfyIDAmOo2vjZjbhiYAW4YN13sKoBQFpJ87k9MZAVuBVjNWM0We69QkvZX4fPpLDXpG0by2EKpuGjwg Evaluating expressions with variables: cubes Discover how to calculate the total surface area of cube-shaped containers with varying side lengths. Learn the formula 6x², where x represents the side length of a cube. Apply this formula to find the surface area of multiple cubes, and add the results to determine the combined surface area that needs painting. https://cdn.kastatic.org/ka-youtube-converted/I9eLKDbc8og.mp4/I9eLKDbc8og.mp4 204 Evaluating expressions word problems https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-expressions-and-variables/cc-7th-evaluating-expressions-word-problems/v/evaluating-exponential-expressions 2023-06-30T02:13:42.781179102Z Evaluating expressions with variables: exponents In this math lesson, we learn to evaluate an algebraic expression with exponents by following the order of operations (PEMDAS). We substitute a given value for the variable, calculate exponents, perform multiplication, and finally, subtraction. By applying these steps, we successfully find the value of the expression. Sal Khan video https://cdn.kastatic.org/googleusercontent/VevVmuIqJ6fgu2cPqwRSB-XNRfrAQhiwQ7NKKXOJybzAeQjwmGgTpwaKHXs0AjQJ3-w_iHl4P27mC9iVXotfPq1kYw Evaluating expressions with variables: exponents In this math lesson, we learn to evaluate an algebraic expression with exponents by following the order of operations (PEMDAS). We substitute a given value for the variable, calculate exponents, perform multiplication, and finally, subtraction. By applying these steps, we successfully find the value of the expression. https://cdn.kastatic.org/ka-youtube-converted/0uCslW40VHQ.mp4/0uCslW40VHQ.mp4 161 Evaluating expressions word problems