A negative minus a negative is equal to another negative number, a positive number or zero, depending upon the numbers in the equation. Subtracting a negative number from another negative number is the same thing as addi... More »

A negative number divided by a negative number always yields a positive number. For instance, -4 / -2 = 2. In other words, there are two -2s in -4. More »

Negative reinforcement is a concept in psychology's theory of operant conditioning that suggests a behavior is strengthened when a negative outcome is stopped, removed, avoided or prevented. Negative reinforcement is an ... More »

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Adding two positive integers results in a positive number, and adding two negative integers yields a negative number. Multiplying two negative or two positive integers makes a positive number, but multiplying a negative ... More »

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A number sentence is an equation or an inequality which is written with numbers and symbols rather than words. The term is most often used in the early grades when students are learning addition, subtraction, multiplicat... More »

A number story is a short story that illustrates a math equation, making it easier for young students to understand the equation involved. For example, the equation 5+2=7 can be told as a story about five birds sitting o... More »

A number model is a sentence that shows how a series of numbers are related. An example of a basic number model could be 12+3=15. More »

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