LCS 4th Math ch. 2.1 Addition Properties and Subtracting Rules
commutative property of addition
numbers can switch places and the sum stays the same
associative property of addition
how numbers are grouped doesn't matter and the sum stays the same
identity property of addition
sum of any number and zero is that number
subtraction rule of zero a
number minus itself equals zero
subtraction rule of zero b
number minus zero equals itself
subtraction rule a example
subtraction rule b example
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