How many legs are there altogether? Problem sums involving multiplication. There are 6 cows in the kraal, each cow has 4 legs.

Count backwards in 10s.
The sequence is $755, 745$. This means we are subtracting 10 each time.

$$745 - 10 = 735$$ $$735 - 10 = 725$$

The sequence is $755, 745, \boxed{735}, \boxed{725}$.

4 less than 548.
To find 4 less than 548, we subtract 4 from 548.

$$548 - 4 = \boxed{544}$$

4 less than 686.
To find 4 less than 686, we subtract 4 from 686.

$$686 - 4 = \boxed{682}$$

4 more than 732.
To find 4 more than 732, we add 4 to 732.

$$732 + 4 = \boxed{736}$$

4 more than 897.
To find 4 more than 897, we add 4 to 897.

$$897 + 4 = \boxed{901}$$