Arithmetic is numbers you squeeze from your head to your hand to your pencil to your paper till you get the answer.

Sandburg’s line turns arithmetic into a physical, almost laboring process: numbers are not merely “known,” they are forced through the body—mind to hand to pencil to paper—until an answer appears. The image emphasizes arithmetic as work and craft rather than inspiration, highlighting the tactile chain of thinking, writing, and calculation. It also gently satirizes how school arithmetic can feel: a squeezing or pressing of thought into symbols, with the student’s body acting as the conduit. In Sandburg’s characteristically plainspoken style, the definition demystifies mathematics while honoring the persistence and manual discipline involved in getting to a result.