[tex]\textsf {Part (a) :}[/tex]
[tex]\implies \mathsf {\frac{3}{4} \times 1\frac{7}{9}}[/tex]
[tex]\implies \mathsf {\frac{3}{4} \times \frac{16}{9}}[/tex]
[tex]\implies \mathsf {\frac{4}{3} = 1\frac{1}{3}}[/tex]
[tex]\textsf {Part (b) :}[/tex]
[tex]\implies \mathsf {4\frac{4}{7} \times 3\frac{1}{4}}[/tex]
[tex]\implies \mathsf {\frac{32}{7} \times \frac{13}{4}}[/tex]
[tex]\implies \mathsf {\frac{104}{7} = 14\frac{6}{7}}[/tex]
[tex]\textsf {Part (c) :}[/tex]
[tex]\implies \mathsf {1\frac{7}{8} \times 2\frac{1}{4}}[/tex]
[tex]\implies \mathsf {\frac{15}{8} \times \frac{9}{4}}[/tex]
[tex]\implies \mathsf {\frac{135}{32} = 4\frac{7}{32}}[/tex]