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Mathematical understanding is an important aspect in learning mathematics. Pirie and Kieren's theory classifies eight layers of mathematical understanding, including image making and image having. In problem solving, these layers can show the students a picture of problem solving. The purpose of this study is to describe the layers of understanding of the image making and image having for junior high school with equivalent mathematical abilities at SMP Negeri 3 Tulungagung. The results of the study show that the layers of understanding of image making and image having of those two students are almost the same with equal abilities. The findings show that both students can show an initial reason for thinking about the idea. There are no significant difficulties from the two subjects. Except for the second subject, there was a little difficulty in describing the completion step when she was given two different builds.

Mathematical Understanding, Pirie and Kieren's Theory, Image making and Image layer having