Si les fraccions tenen el mateix denominador, la suma és una fracció d'igual denominador i numerador suma de numeradors.
1) 15+25=35{\displaystyle {\frac {1}{5}}+{\frac {2}{5}}={\frac {3}{5}}}
2) 12+12={\displaystyle {\frac {1}{2}}+{\frac {1}{2}}=}
3) 23+53={\displaystyle {\frac {2}{3}}+{\frac {5}{3}}=}
4) 26+16={\displaystyle {\frac {2}{6}}+{\frac {1}{6}}=}
5) 920+320={\displaystyle {\frac {9}{20}}+{\frac {3}{20}}=}
6) 635+1835={\displaystyle {\frac {6}{35}}+{\frac {18}{35}}=}
7) 512+112={\displaystyle {\frac {5}{12}}+{\frac {1}{12}}=}
8) 1316+1916={\displaystyle {\frac {13}{16}}+{\frac {19}{16}}=}
9) 117+27={\displaystyle {\frac {11}{7}}+{\frac {2}{7}}=}
10) 1021+421={\displaystyle {\frac {10}{21}}+{\frac {4}{21}}=}
solucions