3 см 7 мм × 4

To multiply the given measurement, first you need to ensure that both measurements are in the same units. So let's convert the entire length to millimeters first. We have:

3 cm 7 mm (you already have 7 mm which is fine)

1 cm is equivalent to 10 mm, so 3 cm is equivalent to 3 × 10 mm, which equals 30 mm.

Now add the 7 mm to get the total length in millimeters:

30 mm + 7 mm = 37 mm

Now you can multiply this by 4:

37 mm × 4 = 148 mm

So, 3 cm 7 mm multiplied by 4 equals 148 mm. If you want to convert this back to cm and mm, you would have:

148 mm ÷ 10 = 14 cm with a remainder of 8 mm.

Therefore, 3 cm 7 mm multiplied by 4 is 14 cm 8 mm.