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Just think of addition and subtraction as directions on the number line. There are also several rules and properties that define how to perform these basic operations. To add integers having the same sign, keep the same sign and add the absolute value of each number. To add integers with different signs, keep the sign of the number with the largest absolute value and subtract the smallest absolute value from the largest. Subtract an integer by adding its opposite. Watch out! The negative of a negative is the opposite positive number.
Steps. 1. Find the denominators of the fractions. If you want to subtract fractions, then the first thing you have to do is to make sure that they have like denominators. The numerator is the number on the top of the fraction and the denominator is the number on the bottom.In the example, 3/4 - 1/3, the two denominators of the fractions are 4 and 3. Circle them.1  If the denominators of the fractions are the same, then you can just subtract the numerators and keep the denominator the same. 2  For example, 4/5 - 3/5 = 1/5. 3  If the fraction is in simplified form, as this one is, then you're done.f you want to subtract fractions, then the first thing you have to do is to make sure that they have like denominators. The numerator is the number on the top of the fraction and the denominator is the number on the bottom.