Lin will take children out to a trapezoidal plot of land, asking them to divide it equally for planting three crops. This teaches them about drawing triangles. Questions about how much seed to sow, how much manure to apply, and so forth also require developing mathematical conceptions. Through these hands-on life experiences, he develops confidence and interest in mathematics among the children.
林宜城會帶學生到菜園，要學生在一塊梯形土地上，平分 3 等分種菜，學生就要學習如何畫出三角形；接著撒下種子，施肥就需要稀釋尿素、秤重等，都會用到數學觀念，從這些生活經驗，讓孩子拾回對數學的信心與興趣。