$2.5 \times 4.3\dot5 \times 1.2\dot3\dot4$
$=\frac{25-0}{10} \times \frac{435-43}{90} \times \frac{1234-12}{990}$
$=\frac{25}{10} \times \frac{392}{90} \times \frac{1222}{990}$
$=\frac{5}{2} \times \frac{392}{90} \times \frac{611}{495}$
$=\frac{119756}{8910}$
$=13.440628\dots$
নির্ণেয় গুণফল $13.440628$ (প্রায়)