4+5+6+2+1=? ?m
18 m
the total perimeter is 44 10+12+4+6+? =44 m
12 m
4+9+6+2+3+7+8=? ?in
39 in
4+6+3+9+8+7+4+5+6=? ?f
52 f
4+5+6+5+8+2+1+9 ?in
40 in
the total perimeter is 56: 12+7+10+22+? = 56 m
5 m
4+7+7+4+6+6=?m
34 m
5+5+6+4+9+1+2+7=?m
39 m
4+5+6+1+2+3+7+8+9=?km
35 km
7+7+7+7+7+7+7+7+7+7+7=? mm
77 mm