**coordinate**A number paired with a point on a number line is called the coordinate of the point.

**counting numbers**The counting numbers are the numbers 1, 2, 3, ….

**difference**The difference is the result of subtracting two or more numbers.

**dividend**When dividing two numbers, the dividend is the number being divided.

**divisor**

When dividing two numbers, the divisor is the number dividing the dividend.

**number line**A number line is used to visualize numbers. The numbers on the number line get larger as they go from left to right, and smaller as they go from right to left.

**origin**The origin is the point labeled 0 on a number line.

**place value system**Our number system is called a place value system because the value of a digit depends on its position, or place, in a number.

**product**

The product is the result of multiplying two or more numbers.

**quotient**The quotient is the result of dividing two numbers.

**rounding**The process of approximating a number is called rounding.

**sum**The sum is the result of adding two or more numbers.

**whole numbers**The whole numbers are the numbers 0, 1, 2, 3, ….

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