12.
a)
[tex]2 \times \frac{2}{5} = \frac{4}{5} [/tex]
b)
[tex]2 \times \frac{4}{7} = \frac{8}{7} = 1 \frac{1}{7} [/tex]
c)
[tex]2 \times 3 \frac{1}{9} = 2 \times \frac{28}{9} = \frac{56}{9} = 6 \frac{2}{9} [/tex]
d)
[tex]2 \times 4 \frac{5}{7} = 2 \times \frac{33}{7} = \frac{66}{7} = 9 \frac{3}{7} [/tex]
13.
a)
[tex]3 \times \frac{7}{12} = \frac{3 \times 7}{12} = \frac{1 \times 7}{4} = \frac{7}{4} = 1 \frac{3}{4} [/tex]
b)
[tex]4 \times \frac{5}{8} = \frac{4 \times 5}{8} = \frac{1 \times 5}{2} = \frac{5}{2} = 2 \frac{1}{2} [/tex]
c)
[tex]2 \times 1 \frac{3}{10} = 2 \times \frac{13}{10} = \frac{2 \times 13}{10} = \frac{1 \times 13}{5} = \frac{13}{5} = 2 \frac{3}{5} [/tex]
d)
[tex]3 \times 2 \frac{7}{9} = 3 \times \frac{25}{9} = \frac{3 \times 25}{9} = \frac{1 \times 25}{3} = \frac{25}{3} = 8 \frac{1}{3} [/tex]
