Subtraction with Packed Blocks - Without Regrouping

Subtraction with packed blocks helps students become very comfortable with the traditional algorithm. They see how the algorithm works. It is important for students to do problems that require regrouping and that do not require regrouping, as in the following example.

	Let’s start with the problem 45 – 13. The first step is to build the number 45 with packed blocks.
	Next, we must remove 13 blocks and see what remains.
	We have removed 13 blocks.
	We are done taking away the blocks. We are left with the answer, 32.