K12 Math Video: Teaching 6.EE.6 Standard Step-by-Step
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Welcome to learning about variables! A variable is like a mystery box that holds a number we don't know yet. We use letters like x to represent these mystery numbers. The variable x could be 5, or 12, or 7, or any other number. Variables help us solve problems when we don't know all the numbers right away.
Now let's learn how to write expressions! An expression is like a math sentence that uses numbers, variables, and operation signs. For example, if we want to say five more than a number, we write n plus 5. If we want to say three less than a number, we write n minus 3. The letter n represents our unknown number, and we add or subtract the known numbers.
Now let's learn about equations! An equation is when two expressions are equal to each other. Think of it like a balance scale. On one side we have x plus 3, and on the other side we have 7. The equals sign tells us that both sides have the same value. So x plus 3 equals 7. This means we need to find what number x represents to make both sides balance perfectly.