2025 AMC 8 Problem 11
Attempt Problem 11 of the 2025 AMC 8 below, then check your answer against the video solution and professionally curated solution from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 2025 AMC 8 solutions, or check the answer key.
All problems are used with official legal permission of the Mathematical Association of America (MAA).
11.
A tetromino consists of four squares connected along their edges. There are five possible tetromino shapes, , , , , and , shown below, which can be rotated or flipped over. Three tetrominoes are used to completely cover a rectangle. At least one of the tiles is an tile. What are the other two tiles?
and
and
and
and
and
Small hint:
Try placing the tile so the leftover region separates cleanly
Big hint:
After one tile is placed, check which pair can tile the rest
Video solution:
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Written solution:
A little trial-and-error suggests placing the tetromino in a way that does not block too much, like this:
It is then easy to see that the remainder can be partitioned into two tetrominoes, and so the answer is C.
Problem 11 in other years
- 1985 AMC 8
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