This product contains 7 worksheets that have students practice using a number line to solve 3 digit subtraction problems that involve some sort of regrouping (ones or tens place or both). There are 3 pages that have examples at the top...great for review, homework (so parents can see how to use the strategy) or a substitute. There are 2 pages of problems without an example at the top. There is 1 page with Challenge Problems! Finally there is a page of word problems where students use the number line to solve them.