It stops you from adding tens to hundreds, or subtracting thousands from millions. The place value is used to line up columns correctly to ensure that the correct values are being used. The decimal point is the deciding factor in locating the proper numbers.
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because if you don't know the place value you might have trouble answering the question and you might get it wrong .
Subtracting a negative integer is the same as adding its absolute value.
What is the definition of Adding and Subtracting Like Fractions
adding
It would equal to zero.