3 Digit Addition/Subtraction with/without Regrouping is a collection of worksheets done in EXCEL to help students keep place value columns straight.
There are 5 worksheets with answer keys. 10 problems are included on each page with 3 addition and 7 subtraction problems. These include regrouping and no regrouping.
I have used these for years for RTI to pinpoint where students need help in addition and subtraction basic skills. There is enough space on the page to have students correct their mistakes.