2-Digit Addition Worksheets
Free printable 2-digit addition worksheets for grades 1-4. Master addition with and without regrouping (carrying).
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Easy: No regrouping | Medium: Some regrouping | Hard: All regrouping + 3-number problems
Understanding 2-Digit Addition
Two-digit addition builds on single-digit addition skills by introducing place value concepts. Students learn to add tens and ones separately, and when necessary, "regroup" (carry) when a column sum exceeds 9.
Without Regrouping (Easy)
Example: 23 + 45
23 + 45 ---- 68
Step 1: Add ones (3+5=8)
Step 2: Add tens (2+4=6)
Answer: 68
With Regrouping (Medium/Hard)
Example: 47 + 38
¹ 47 + 38 ---- 85
Step 1: Add ones (7+8=15, write 5, carry 1)
Step 2: Add tens (1+4+3=8)
Answer: 85
Teaching Regrouping (Carrying)
Regrouping (also called "carrying") is one of the most important concepts in elementary math. When the sum of a column is 10 or more, we write the ones digit and "carry" the tens digit to the next column.
Step-by-Step Teaching Approach:
- Use Base-10 Blocks: Physically show that 10 ones can be traded for 1 ten. This concrete manipulation makes the abstract concept visible.
- Always Start in Ones Place: Emphasize that we always add from right to left (ones, then tens, then hundreds).
- Write the Small "1" Above: Show where the carried digit goes - above the next column to the left.
- Practice Without Regrouping First: Build confidence with simpler problems before introducing carrying.
- Estimate Before Solving: Round to nearest ten: 47+38 is about 50+40=90, so the answer should be close to 90 (it's 85).
3-Number Addition (Hard Mode)
Our hard difficulty includes adding three 2-digit numbers at once - perfect for advanced learners or grade 3+ students!
Example: 23 + 45 + 67
¹ ¹ 23 45 + 67 ---- 135
Step 1: Add ones (3+5+7=15, write 5, carry 1)
Step 2: Add tens (1+2+4+6=13, write 3, carry 1)
Step 3: Write the final carry as hundreds
Answer: 135
Common Mistakes to Watch For
❌ Forgetting to Carry
Students add 7+8=15 but forget to carry the 1, writing 155 instead of 85. Solution: Use color coding or checkboxes to track carrying.
❌ Adding Left to Right
Adding tens before ones causes errors with regrouping. Solution: Practice highlighting the ones column first.
❌ Misaligning Numbers
Writing 47 + 8 without aligning place values. Solution: Use graph paper or lined paper turned sideways for columns.