The associative property states that you can change the groupings of numbers being added or multiplied without changing the sum. For example: (2+3) + 4 = 2 + (3+4), and (2 X 3) X 4 = 2 X (3 X 4).
The commutative property states that the order in which two numbers are added or multiplied does not affect the sum or product. For example .
In common use, a decimal refers to part of a whole number. The numbers to the left of a decimal point represent whole numbers, and each number to the right of a decimal point represents a fractional part of a power of one-tenth. For instance: The decimal value 1.24 indicates 1 whole unit, 2 tenths, and 4 hundredths (commonly described as 24 hundredths).
To estimate is to find an approximate answer that is reasonable or makes sense given the problem.
Rounding is reducing the number of non-zero digits in a number while keeping the overall value of the number similar.
Find out how to identify and use the commutative and associative properties of addition with decimals.