We know that $14-13=1$14−13=1.

Use this to find:

$34-13=\editable{}$34−13=

$44-13=\editable{}$44−13=

$54-13=\editable{}$54−13=

$74-13=\editable{}$74−13=

Use what you know about subtracting to find:

We know that $29-14=15$29−14=15.

We know that $38-25=13$38−25=13.

Know how many ones, tens, and hundreds are in whole numbers to at least 1000.

Generalise that whole numbers can be partitioned in many ways