Video About Adding 3-Digit Numbers Using Mental Math

The Basics of Adding and Subtracting Expressions

Adding and subtracting expressions is like combining or taking away things you have. Instead of numbers we can have letters or numbers in our expressions. For example, Adding expressions: If you have the expression "x + 3," it means you have "x" of something, and someone gives you 3 more. So, "x + 3" would be "x plus 3." Subtracting expressions ...

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$Dr. Arthur Brooks on Instagram: "Satisfaction works a lot like a fraction. You can try to increase the numerator by getting more, or you can shrink the denominator by wanting less. One of those approaches is far more durable. Our instincts push us to accumulate. More status, more possessions, more validation. That impulse was useful for survival, but it was never designed to make us happy. When we keep feeding it, satisfaction stays just out of reach. Traditions of religion and philosophy have b$