Q: Represent the number 1 using the numbers 2, 3, 4, 5, 6, 7, 8 and 9 one time each.

A: 1 to the 23,456,789 power = 1!
Also 1 + (2 – 3) – (4 – 5) + (6 – 7) – (8 – 9) =
1 + -1 -(-1) + -1 -(-1)
1 – 1 + 1 – 1 + 1

The integer at the top of each of these 9 rectangles is the sum of four addends contained in each rectangle. Shade the boxes containing the addends you use to get the sum. You will use one addend in each row.
Notice that the 4 numbers circled to make -2 are not the right combination.

Make three three-digit numbers that add up to as close to 1000 as possible using the digits 1- 9 only one time each.

There are multiple answers that would get 999 such as 247 + 563 + 189 or 164 + 237 + 598.

Is 1000 even possible? Here is a link to a Geogebra to help you check.