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The article deconstructs approach to written subtraction applied in the primary national strategy's (PNS') "guidance paper" Calculation (DIES, 2007) in the U.S. The approach to subtraction is divided into three stages. The first stage provides recommendations which parallel those outlined for additions. The second stage suggests a backward step while the third step involved an expanded method.

The article focuses on the concept of mathematical study and teaching of students for mathematics lesson in the U.S. It mentions that the students use bright colored, pens that helps in attaining visual clues. It states that the teachers can understand the learners through the mathematical journals. It focuses on the use of cartoons and the sense of humor in learning.