How to Add and Subtract with Variables

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Imagine you have a math problem that involves more than one thing you don't know. Let's say you want to figure out how much money you'll have after saving for a certain number of months. You have two unknowns: the amount of money you save each month and the number of months you save. • To solve this problem, you need to use variables. A variable is like a placeholder for an unknown value. So, you could use the letter m to represent the number of months and the letter s to represent the amount of money you save each month. • Now you can create a math expression using these variables. It might look something like this: Total money = s * m. This means that the total amount of money you'll have is equal to the amount you save each month multiplied by the number of months you save. • By having these variables in the expression, you can solve the problem for different scenarios. For example, if you save $10 each month and save for 5 months, you can substitute those values into the expression: Total money = 10 * 5 = $50. • So, by using variables, you can represent and solve problems that involve more than one unknown quantity. They help you understand and find answers to different situations by giving you a way to work with unknown values in a math equation. • More Lessons: http://www.MathAndScience.com • Twitter: / jasongibsonmath

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