3 × \frac{1}{4} = \frac{3×1}{4} = \frac{3}{4} = 0.75
15 × \frac{3}{5} = \frac{15×3}{5} = \frac{45}{5} = 9
12 × \frac{5}{4} = \frac{12×5}{4} = \frac{60}{4} = 15
30× \frac{4}{25} = \frac{30×4}{25} = \frac{120}{25} = 4,8
7 × 2 \frac{1}{4} = 7× \frac{2×4+1}{4} = 7× \frac{9}{4} = \frac{7×9}{4} = \frac{63}{4} = 15,75
6 \frac{2}{3} × 9 = \frac{6×3+2}{3} × 9 = \frac{20}{3} × 9 = \frac{20×9}{3} = \frac{180}{3} = 60
