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This research aims to design learning materials with context of onion plantation in Brebes, Central Java, Indonesia. The research began with the observation and interview on how farmer manage and cultivate the plantation area of onions. Finding from this exploration is “gondang”, area of onion plantation made by farmer by which the area larger than that with no gondang. From this finding, designer adopt it to the class. Grid paper is chosen as mathematics tools to model the everyday situation to be mathematics. The preliminary design of the learning materials is learning design on Geometry and Measurement with the applicative domain consider on Princip-s of Realistic Mathematics Education.