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- https://math.libretexts.org/Courses/Hartnell_College/Mathematics_for_Elementary_Teachers/04%3A_______Addition_and_Subtraction/4.02%3A_CombiningBecause it is a Base Ten system, an exchange can be made any time there are ten of the same symbol by replacing ten of one symbol for the next higher symbol . To show that an exchange is being made, y...Because it is a Base Ten system, an exchange can be made any time there are ten of the same symbol by replacing ten of one symbol for the next higher symbol . To show that an exchange is being made, you can circle, put a box around or underline ten of the same symbol. A group of 20 at one level can be traded for one dot at the next level up except from the second to the third level where a group of 18 at the second level can be traded for one dot at the third level.
- https://math.libretexts.org/Courses/College_of_the_Desert/College_of_the_Desert_MATH_011%3A_Math_Concepts_for_Elementary_School_Teachers__Number_Systems/05%3A_Addition_and_Subtraction/5.02%3A_CombiningA group of 20 at one level can be traded for one dot at the next level up except from the second to the third level where a group of 18 at the second level can be traded for one dot at the third level...A group of 20 at one level can be traded for one dot at the next level up except from the second to the third level where a group of 18 at the second level can be traded for one dot at the third level. The arrow indicates a dot will be on the next level up in the next step in place of the amount boxed at the original level.
- https://math.libretexts.org/Courses/Coastline_College/Math_C104%3A_Mathematics_for_Elementary_Teachers_(Tran)/04%3A_______Addition_and_Subtraction/4.02%3A_CombiningBecause it is a Base Ten system, an exchange can be made any time there are ten of the same symbol by replacing ten of one symbol for the next higher symbol . To show that an exchange is being made, y...Because it is a Base Ten system, an exchange can be made any time there are ten of the same symbol by replacing ten of one symbol for the next higher symbol . To show that an exchange is being made, you can circle, put a box around or underline ten of the same symbol. A group of 20 at one level can be traded for one dot at the next level up except from the second to the third level where a group of 18 at the second level can be traded for one dot at the third level.
