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To add a negative number and a positive number: -- Find the difference of their absolute values (their sizes, ignoring their signs). -- Give it the same sign as whichever of the original two numbers had the larger absolute value.
The only month that has the same number of letters in its name as the number is "May." "May" has three letters, and it is the fifth month of the year. None of the other months have this unique characteristic of having the same number of letters as their position in the calendar year.
The absolute value of a negative number is positive.
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Each integer is a whole number and each whole number is an integer. So the set of all integers is the same as the set of all whole numbers. By the equivalence of sets, integers and whole numbers are the same.