chalkboard not well sponged the simplest arithmetic problem mathematics adding two numbers together white brick |
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| navigate by keyword : adding addition arithmetic assimilation background beginning blackboard blank board brick calculate calculation chalk chalkboard classroom correct creativity education equals equation good growth inside joy knowledge learn lesson lettering light luck math mental mind missing numbers operation pathway plus problem ready school score sign simplicity structure students sum texture two wall white writing written |
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| White brick wall. It`s written in white chalk on a blackboard - two plus two equals four. The basics of arithmetic start with the youngest grades in every school in the world. |
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