2-Digit Addition Worksheets

Begin with Carrying on None for a first pass, so a child learns to add the ones and then the tens without any extra step. After a lesson on regrouping, switch to Every problem for focused practice, then to Mixed to see if they notice when carrying is needed. Ten minutes is plenty. Check with the answer key and have the child explain a carrying problem aloud. Use In a row for mental math days.

Adding 2-digit numbers is the first time a child works with place value in a calculation. The ones are added first, and when they total ten or more, a ten moves to the tens column. The usual error is writing both digits of the ones total, or forgetting the carried ten. Facts to 20 come before this, and 3-digit addition follows naturally. Saying the place of each digit aloud helps.

Use 12 problems when carrying is new, because there is more space to work. Mixed is the most test-like, but it can hide the fact that a child is avoiding carrying, so check a few by hand. Missing number mode, with one addend hidden, strengthens understanding. Tens-and-ones drawings help when a child is stuck, and graph paper helps with alignment.

When should a child start carrying?

Once they add two 1-digit numbers to 20 comfortably and know what the tens column means. Practice with Carrying set to None first, then Every problem to build the method before mixing.

What does the Mixed carrying option mean?

Some problems carry and some do not, like a real test. It shows whether the child spots when carrying is needed. For first lessons, use None or Every problem for a more focused session.

Why does my child write both digits of the ones total?

They are not yet separating the ones digit from the carried ten. Use place value blocks and write the ten above the tens column. Saying out loud, 'write the ones, carry the ten', helps.