Whole Number and Operations

Compatible numbers are pairs of numbers that are easy to add, subtract, multiply, or divide mentally.

To find a value that is close enough to the right answer, usually with some thought or calculation involved

about, a little more/less than, close to, approximately

The result of subtracting one number from another. How much one number differs from another.

The result of adding two or more numbers.

When dividing by a certain number gives a whole number answer.

Numbers we can multiply together to get another number.

The answer when two or more values are multiplied together.

To simplify (or reduce) a fraction or expression means to make it as simple as possible.

The rules that say which calculation comes first in an expression.

A symbol for a value we don't know yet. It is usually a letter like x or y.