## Using \$10 and \$1 Bills to Represent Regrouping in Addition or Subtraction

Money is intuitive for many students, even when the underlying math is not. For example, I often find that students who do not understand well the concept of Base 10 place value do understand \$10 and \$1 bills. With this in mind, I created a virtual scaffolded handout that builds on student intuitive understanding of the bills through the use of \$10 and \$1 bills to represent regrouping. Here is a video showing how I use it.

In the photo below, at the top, a \$10 bill was borrowed into the ones column. The reason is that \$7 needed to be paid (subtracted) but there were only five \$1 bills. In the photo below, bottom, the \$10 bill was converted into ten \$1 bills. On the left side of the handout, the writing on the numbers shows the “mathy” way to write out the borrowing.

Once the student begins work with only the numbers, the \$10s and \$1s can be referenced when discussing the TENS and ONES places of the numbers. This will allow the student to make a connection between the numbers and their intuitive, concrete representation of the concept.

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