70.21 7

$$70\frac{1}{7} \cdot \frac{1}{7} = (70+\frac{1}{7}) \cdot \frac{1}{7} = 70 \cdot \frac{1}{7} + \frac{1}{7} \cdot \frac{1}{7} = 10 + \frac{1}{49} = 10\frac{1}{49}$$

Ответ: $$10\frac{1}{49} $$