3.FractionsIn a fraction n/d, n is the numerator and d is the denominator. The denominator of a fraction can never be 0 , because division by 0 is not defined. Two fractions are said to be equivalent if they represent the same number. For example,4/18 and 6/27 are equivalent since they both represent the number 2/9. In each case the fraction is reduced to lowest terms by dividing both the numerator and the denominator ny their greatest common divisor ( GCD ) . The GCD of 4 and 18 is 2 and GCD of 6 and 27 is 3*Addition and subtraction of fractions Two fraction with the same denominator can be added or subtracted by performing the required operation with the numerators, leaving the denominators the same. For example3/5 + 4/5 = 3+4/5 =7/5 and 5/7 - 2/7 = 5-2/7 = 3/7If two fractions do not have the same denominator, express them as equivalent fractions with the same denominator. For example, to add 3/5 and 5/7, multiply the numerator and denominator of the first fraction by 7 and the numerator and the numerator and denominator of the second fraction by 5, obtaining 21/35 and 25/35 respectively:21/35 + 25/35 = 46/35.
đang được dịch, vui lòng đợi..