Directions: Using the digits 1 to 9 at most one time each, place a digit in each box to make two different pairs of three-digit numbers that form a true number sentence. You may reuse all the digits each difference.

### Hint

How can we determine which digits would be poor choices to place?

### Answer

There are many possible answers including 874 – 291 = 583 and 587 – 291 = 296. To be clear, the 291 in the number being subtracted to not count as being used.

Source: Robert Kaplinsky

I am working on this with my students right now and they were curious why you decided to subtract 291 of all the 3 digit numbers. Thanks!