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1) $3\frac{7}{8} + 4 \frac{5}{12} =3+4 +\frac{7}{8} +\frac{5}{12} = 7+\frac{21+10}{24} =7\frac{31}{24} = 8 \frac{7}{24}$

2) $4\frac{3}{14} + 3\frac{2}{21} =4+3 +\frac{3}{14} +\frac{2}{21} = 7 +\frac{9+4}{42} = 7\frac{13}{42}$

3) $2-\frac{14}{17} = \frac{34-14}{17} =\frac{20}{17} = 1\frac{3}{17}$

4) $4\frac{8}{15}-2\frac{1}{30} = 4-2 +\frac{16-1}{30} = 2 \frac{15}{30} = 2 \frac{1}{2}$

5) $8\frac{1}{10}-3\frac{1}{6} = 8-3 + \frac{3-5}{30} = 4 \frac{28}{30} = 4\frac{14}{15}$

6) $11 - 7\frac{4}{7} =\frac{77}{7} -\frac{53}{7} = \frac{24}{7}= 3 \frac{3}{7}$

a) $x+4\frac{3}{5}=7$ $x=7-4\frac{3}{4} =\frac{28}{4}\frac{19}{4} =\frac{9}{4} =2\frac{1}{4}$ $x=2\frac{1}{4}$

b) $7\frac{3}{11} -y=3\frac{1}{4}$ $y= 7\frac{3}{11} =3\frac{1}{4} = 7-3 +\frac{3}{11} -\frac{1}{4} =\frac{12-11}{44} =4 \frac{1}{44}$