Question

2)6,4-3/20 3)9,8×3/10

Answer 1

$6.4 - \frac{3}{20} = \frac{32}{5} - \frac{3}{20} = 6 \frac{1}{4} \\ \\ 9.8 \times \frac{3}{10} = \frac{49}{5} \times \frac{3}{10} = 2 \frac{47}{50}$