That's in the right order.
1m 3 dm 7 cm 18 mm
No because 7cm is 70mm
No, 10 is less than 18. Just like 10 dollars is less than 18 dollars.
It is 343 cubic cm
area= 7cm x 7cm = 49cm^2
18mm is 0.70866 inches.
There are: 70mm = 7cm
18mm is 1.8cm
they are 7cm by 7cm
There are: 70mm = 7cm
18mm = 0.018m