Unit 2 Math

Addend

A number that is added to another number.

Cummutative Property of Addition

Addends can be in any order and the sum remains the same.

Associative Property of Addition

Addends can be regrouped and the sum remains the same.

Compensation

Adjusting one number to make a computation easier and balancing the adjustment by changing another number.

Compatible Numbers

Numbers that are easy to compute with mentally. Number are close in value to the actual numbers.

Inverse Operations

Opposite operations that undo each other such as addition and subtraction.

Round

Rounding involves either increasing or decreasing a number to the next digit. Rounding means making a number simpler but keeping its value close to what it was. The result is less accurate, but easier to use. Can be used to estimate an answer.

Equivalent Decimals

To align decimal points in a decimal addition problem, annex zeros so that all addends have the same number of decimal places.

Difference

the answer to a subtraction problem.

Sum

the answer to an addition problem.

Equivalent

two numbers or expressions that have the same value.