Math Facts

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Addition is the mathematical operation of combining two or more numbers to obtain a total.

The commutative property states that changing the order of the addends does not change the sum (e.g., a + b = b + a).

The associative property states that the way in which numbers are grouped in addition does not change the sum (e.g., (a + b) + c = a + (b + c)).

The identity property states that the sum of any number and zero is the number itself (e.g., a + 0 = a).

To solve a basic addition problem, align the numbers vertically by place value and add each column starting from the right.

A number line is a visual representation of numbers in a straight line, used to illustrate addition by moving to the right from the first number by the value of the second number.