Subtracting with regrouping

In this lesson, we will learn:

• How to regroup base ten block models ("borrowing" or "exchanging")
• How to subtract using base ten block models

• Like addition, we will also need to regroup our base ten blocks for subtraction


• When we don't have enough to subtract, we need to borrow from the next place value up to make more (splitting up the base ten block models)
• Sometimes, this is called "exchanging"

1 ten can be exchanged into 10 ones
1 hundred can be exchanged into 10 tens
1 thousand can be exchanged into 10 hundreds