Fundamental Law of Fractions

The fundamental law of fractions states that the value of a fraction does not change when its numerator and denominator are both multiplied by the same non-zero number. It can be applied to add or subtract two fractions and . Multiply the first by and the second by . Then the fractions have a common denominator (not necessarily the lowest!) and the new numerators can be added:

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Related Curriculum Standards

US Common Core State Standards, Mathematics