Two-Digit Addition Practice
20 questions · 60 seconds · numbers 10–99, vertical format
Free · no login · instant feedback on every answer
Step up from facts to real computation: two-digit addition presented vertically, the way it is written on paper, with numbers from 10 to 99. Some problems need regrouping (carrying) and some don't — just like a real worksheet.
Two-digit addition is where place-value understanding becomes visible. Students who add the ones, carry cleanly, and then add the tens are demonstrating the foundation that every larger algorithm — three-digit addition, multiplication, long division — is built on.
Tips That Make It Stick
- Ones first, always. Add the ones column, regroup if it passes 9, then add the tens. Skipping to the tens first is the most common bad habit.
- Estimate before answering. 47 + 38 is close to 50 + 40 = 90, so an answer of 75 should feel wrong immediately.
- Say the carry out loud. "Seven plus eight is fifteen — write five, carry one." Verbalizing the regroup step prevents silent slips.
Frequently Asked Questions
What is regrouping in addition?
When a column adds to 10 or more, the extra ten is carried into the next column: in 47 + 38, the ones make 15, so 5 is written and 1 ten is carried. It is also called carrying.
What grade practices two-digit addition?
Two-digit addition without regrouping starts in 1st grade; regrouping is a 2nd grade skill that stays in review through 3rd grade.
Can I practice only regrouping problems?
Yes — load the game, open game settings, and set regrouping to "required" so every problem carries. You can also set it to "none" for a gentler start.
📝 Matching Printable Worksheets
Prefer paper practice? These free PDF worksheets cover the same skill — each includes an answer key: