In a 3x3 grid filled with numbers 1–9 left to right, what number ends up in the top-left cell after a 90-degree clockwise rotation?

In a 3x3 grid filled with numbers 1–9 left to right, what number ends up in the top-left cell after a 90-degree clockwise rotation?

• A. 1
• B. 7
• C. 4
• D. 9

Answer: (B)

When you rotate a 3x3 grid clockwise by 90 degrees, the left column becomes the top row in reverse order. The left column in the original grid is 1, 4, 7, so after rotation the top row becomes 7, 4, 1. That places 7 in the top-left corner. For quick verification, 1 ends up at the top-right, 4 at the top-middle, and 9 moves to the bottom-left.

When you rotate a 3x3 grid clockwise by 90 degrees, the left column becomes the top row in reverse order. The left column in the original grid is 1, 4, 7, so after rotation the top row becomes 7, 4, 1. That places 7 in the top-left corner. For quick verification, 1 ends up at the top-right, 4 at the top-middle, and 9 moves to the bottom-left.