Add two 2-digit numbers in columns. Grade 1-3 Addition Worksheet. Help your students master two digit addition and subtraction with and without regrouping by using these 48 pages two-digit adding and subtracting worksheets. Math facts using 2 digit addition by 2 or 3 number and 2 digit subtraction are great for warm ups, reviews, homework, classwork, independent work, etc. There are 12-20 problems on each worksheet. They are both mixed (addition and subtraction) and separated (just addition, jus