Addition and subtraction number concept is introduced to students since they are in grade 1 in elementary school. They study addition and subtraction for number 1 to 100. In grade 2 They study mixed number. For example, What is solution 26 + 4 – . . . = 8 ?. Almost students can not answer this question directly because it is abstract problem. Teacher must change it into real context which is easy for students to understand. In this article, writer introduces Snake and stair (Ular tangga) solution.

Snake and stair game is a game which is played by four students. Each student has a pawn, and he/she gets opportunity to shack cube. Cube has number 1 to 6. A student will put his/her pawn building on number in cub that he/she gets. Student’s cub which stand in stair will climb that stair but in snake will reduce, so they use mathematics process in this game.

Snake and Stair Game

Example :

1. A student’s pawn put in number 11 than he shack a cube and get number 5, so he move his pawn 5 step . Finally, the student put his pawn in number 46 because he got stair. How many extra point that student get ?

This is mathematics model about it :

11 + 5 + . . . = 46

2. A student’s pawn put in number 51 than he shack a cube and get number 3, so he move his pawn 3 step . Finally, the student put his pawn in number 26 because he got snake. How many extra point that student get ?

This is mathematics model about it :

51 + 3 + . . . = 26 or 51 + 3 – . . . = 26

If Teacher gives abstract problem, some students can not solve it. This illustration can help students find model and know how to solve many problems about it.

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