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   1.- Addition of fractions with the same denominator.

   We have one piece of cake (1/5) and we add 2 pieces (2/5). Finally we have three pieces (3/5).

   To add fractions with the same denominator, we must add the numerators, keeping the same denominator.

   Examples: 2/7 + 3/7 + 1/7 = 6/7; 5/9 + 8/9 = 13/9

   Solve these sums:

      2.- Addition of fractions with different denominators.

      First, we must reduce the two fractions to a common denominator: 1/2 + 1/4 = 4/8 + 2/8
      Then, we sum 4/8 + 2/8 = 6/8

      To add fractions with different denominators, we must reduce them to a common denominator and then, we must apply the previous rule.

     Do these sums:

   3.- Addition of mixed numbers

   To add mixed numbers, we add the whole numbers and the fractional parts.

   Examples 3 1/3+ 2 1/3 = (3 +2) and (1/3 + 1/3) = 5 2/3 1 1/4 + 2 1/3 = (1 +2) + (1/4 +1/3 = 3/12 + 4/12) = 3 7/12.

   Do these sums of mixed numbers. Do it on paper and check it.

   4.- Simplified fractions.

   If we divide the numerator and the denominator of a fraction by the same number, we obtain a simplified fraction.

   Examples: 6/15 = 6:3 / 15:3 = 2/5; 8/12 = 4/6 = 2/3, 9/12 = 3/4.

   Simplify these fractions:

    5- Add these fractions and simplify the result. 

    Do these operations on a paper.
 
   Recuerda que 2/2 = 3/3 = 4/4 = 1

    6- Do these problems 

    Do it on a paper and check it:

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