Выполните умножение устно, запишите результат.

a)

• \[ 8 \cdot 8 = 64 \]
• \[ 1\frac{2}{6} \cdot 6 = \frac{8}{6} \cdot 6 = 8 \]
• \[ 1\frac{1}{2} = 1 \]
• \[ 1\frac{2}{7} \cdot 7 = 34 \]

б)

• \[ 35 \frac{2}{5} \cdot 5 = 35 \cdot 5 + \frac{2}{5} \cdot 5 = 175 + 2 = 177 \]
• \[ 9\frac{1}{18} \cdot 1 = \frac{163}{18} \]
• \[ 2\frac{1}{3} \cdot 2 = \frac{7}{3} \cdot 2 = \frac{14}{3} \]
• \[ 18\frac{1}{4} \cdot 9 = 162 + \frac{9}{4} = 162 + 2\frac{1}{4} = 164\frac{1}{4} \]

в)

• \[ 12\frac{1}{5} \cdot \frac{1}{12} = \frac{61}{5} \cdot \frac{1}{12} = \frac{61}{60} \]
• \[ 80\frac{1}{5} \cdot \frac{1}{20} = \frac{401}{5} \cdot \frac{1}{20} = \frac{401}{100} \]
• \[ 16\frac{1}{8} \cdot \frac{1}{4} = \frac{129}{8} \cdot \frac{1}{4} = \frac{129}{32} \]
• \[ 32\frac{1}{9} \cdot \frac{1}{8} = \frac{289}{9} \cdot \frac{1}{8} = \frac{289}{72} \]