Topic 2 ~ Adding and Subtracting Whole Numbers and Decimals
Commutative Property of AdditionWhen two numbers are added, the sum is the same regardless of the order of the addends.
Associative Property of AdditionWhen three or more numbers are added, the sum is the same regardless of the grouping of the addends.
Identity Property of AdditionThe sum of any number and zero is the original number.
For example 5 + 0 = 5. |
Vocabulary
compatible numbers
compensation rounding commutative property of addition associative property of addition Adding and Subtracting Decimals- line up the decimals (this lines up the place value)
- fill in empty spaces with zeros so that all place values are filled 24.890 - 03.127 21.763 - bring the decimal straight down and place it in the answer |