A property where you add an amount to one number and substract an amount to the other to make a simpler addition.
Ex: 58+72 = (58+2) + (72-2)
This way you get an easy operation, 60+70 and can do it mentally, etc.
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compare how compensation is different in addition and subtraction
Compensation in math means, adding and subtracting the same number to make the sum or difference easier to find.
the answer is the commutative property
The Multiplicative Property of 1.
It is the property that 1 is the multiplicative identity for sets of numbers.