Directions: Make the largest (or smallest) absolute difference by filling in the boxes using the whole numbers 1 through 9 no more than one time each.

### Hint

### Hint

What are the biggest and smallest numbers you can make with these digits in scientific notation?

Try thinking of the numbers you create on a number line.

Try thinking of the numbers you create on a number line.

### Answer

### Answer

Largest: 8×10^9 – 2×10^1

Smallest 3×10^2 – 9×10^1

Smallest 3×10^2 – 9×10^1

Source: Marie Isaac

For smallest difference, one of my classes found the following:

1 x 10^3 – 9 x 10^2

1 x 1000 – 9 x 100

1000 – 900 = 100