He has to buy 3.7 m, and eat the wasted 0.03 m.
(No big deal. It's just a little over 1 inch.)
Meter
3.5 of a meter
4.5 meters = 45 tenths of a meter
40 cm
16 tenths of a meter equals 1.6 meters
2/4
20 centimetres
10 of them.
Three-tenths of a meter.
0.4m or 40cm or 400mm
70cm
30