This lesson is a power point that uses manipulatives to show how to add and subtract decimals. There are questions that require regrouping and borrowing. Many students start to understand what it means to carry the 1 when adding and what it means to borrow from "the neighbor" when subtracting. There are 4 addition problems and 4 subtraction problems.
Also included in this is a working memory activity. Display the words on the screen for one minute. All the students can do during the one minute is look at the words and try to remember them. After the one minute remove the words from the board and have the students write down as many words as they can!