Open Middle®
Directions: Using the digits 0 to 9 at most one time each, fill in the boxes so that the values of each expression increases from least to greatest.
Each number may only be used once.
Hint
How else could these be represented / rewritten? Where should the 0 go? Why?
Answer
There are many possible answers. Here are a couple of solutions: 1, 5
7, 0
6, 4
2, 8 (or 8, 2)
3, 9 (or 9, 3); 1, 9 8, 0 7, 3 4, 5 2, 6
7, 0
6, 4
2, 8 (or 8, 2)
3, 9 (or 9, 3); 1, 9 8, 0 7, 3 4, 5 2, 6
Source: John Rowe
