Open Middle®
Directions: Using the digits 0 to 9, at most one time each, place a digit in each box 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