Topic 2 - Adding and subtracting whole numbers and decimals
Whiteboard Tools - the decimals number lines tool
Commutative Property of Addition
When two numbers are added, the sum is the same regardless of the order of the addends.
Associative Property of Addition
When three or more numbers are added, the sum is the same regardless of the grouping of the addends.
Identity Property of Addition
The sum of any number and zero is the original number.
For example 5 + 0 = 5.