Question

5yd 1ft 4in - 2yd 2ft 8in

Answer 1

Do the subtraction like a normal (numerical subtraction) with borrowing. The only difference is when you borrow, you don't always get 10 from the next digit, but the appropriate number from the next <i>unit</i>.

For example,
4yd 2ft 4in - 3yd 1ft 9in

Put them one on top of the other if you wish:
4yd 2ft 4in
3yd 1ft 9in

4in - 9in , we need to borrow to get 1ft+4in=16in
so 16in - 9in = 7in.

4yd 2ft 4in
3yd 1ft 9in
------------
?yd ?ft 7in

Now 2ft on top becomes 1ft (after borrow), so 1ft-1ft =0ft

4yd 2ft 4in
3yd 1ft 9in
------------
?yd 0ft 7in

Finally, 4yd - 3yd = 1 yd

4yd 2ft 4in
3yd 1ft 9in
------------
1yd 0ft 7in

Proceed this way for your problem, and post for answer check if you wish.