Add a 1-Digit and a 2-Digit Number Worksheets for 1st Grade
Vertical column addition combining a two-digit and a one-digit number. 15 free printable worksheets, each with an answer key.
Save to PinterestFree Add a 1-Digit and a 2-Digit Number Worksheets
Click a worksheet to open the PDF, or grab the matching answer key. Every sheet prints on one page.
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Add a 1-Digit and a 2-Digit Number: what children learn
This is the first time a 1st grader adds numbers of different sizes stacked in columns — the ones digits line up under each other, which is what makes column addition work.
Add a 1-Digit and a 2-Digit Number: worked example
23 + 5 = 28
Line up the ones: 3 + 5 = 8. The tens digit (2) carries straight down since there's nothing to add to it. Answer: 28.
Add a 1-Digit and a 2-Digit Number: a common mistake to watch for
Kids sometimes misalign the digits when writing the problem by hand — using grid or graph paper helps keep place values lined up.
Add a 1-Digit and a 2-Digit Number: how to help at home or in class
Write a problem such as 34 plus 5 on grid paper, one digit per box, so the ones sit directly under each other. Have your child circle the ones, add them first, and then bring the tens down. Before writing, ask whether the tens will change, which helps catch careless errors. Use a hundred chart to hop forward and check the answer. Once your child lines up digits without prompting and answers correctly, try adding two-digit numbers.
What is on these Add a 1-Digit and a 2-Digit Number worksheets
This set has 15 different worksheets for 1st grade, with 17 questions on each and a matching answer key for every sheet. The instruction printed on each worksheet is: “Add the numbers in columns and write the sum.”
Example questions like the ones on these worksheets, with their answers:
- 7 + 22 = 2929
- 76 + 3 = 7979
- 33 + 1 = 3434
- 41 + 8 = 4949
- 1 + 17 = 1818
- 72 + 7 = 7979
- 2 + 56 = 5858
- 7 + 20 = 2727
Every answer on every sheet is checked by a separate program before the worksheet is published. How we check answers