Skill: Add a 1-digit number to a 2-digit number without regrouping
Explanation and Free Practice Resources
This understanding involves combining a two-digit number (10–99) with a one-digit number (0–9) when the ones digits total less than 10, so the ones are combined while the tens value remains unchanged. Place-value representations and number-line reasoning show why no exchange of 10 ones for 1 ten is needed, establishing a foundation for multi-digit addition; cases requiring regrouping or larger, more general addends are outside this scope.
On this page:
- Learn “Add a 1-digit number to a 2-digit number without regrouping” with a detailed explanation of the concept
- Master “Add a 1-digit number to a 2-digit number without regrouping” with unlimited, free practice problems
- Download (or modify) a free worksheet on Add a 1-digit number to a 2-digit number without regrouping you can use at home or in class with practice problems that scaffold and explore “Add a 1-digit number to a 2-digit number without regrouping” from different perspectives.
- Start working on adaptive units like “Base Ten Blocks - Counting Intro” or “Number Sense - Basics” that introduce, teach, or practice “Add a 1-digit number to a 2-digit number without regrouping” to maximize your learning.
Detailed Explanation: Add a 1-digit number to a 2-digit number without regrouping
To add a 1-digit number to a 2-digit number, add the ones first. If the ones total is less than , the tens stay the same.
Example:
- Break apart into tens and ones.
- Add the ones:
- The ones total is , which is less than . So, no new ten is needed.
- Keep the tens and use the ones:
So, .
Learn by doing: Add a 1-digit number to a 2-digit number without regrouping
Click a topic below to practice the foundational skills you'll need, learn the steps, or master this skill
Your results
Practice with unlimited practice problems
Practice:
Addition - Whole Number 2 digit + 1 digit, No Carry
Earned ?
Download/Modify Free Grade 2 'Add a 1-digit number to a 2-digit number without regrouping' Worksheet
Print this free 'Add a 1-digit number to a 2-digit number without regrouping' worksheet to practice this skill away from the computer. Click 'Modify' to easily customize this worksheet to your exact needs.
This Worksheet Includes:
- Addition - Whole Number 2 digit + 1 digit, No Carry
- Addition - Whole Number 2 digit + 1 digit - Column, No Carry
- Addition - Whole Number 1 digit + 1 digit - Column, No Carry
- Addition - Whole Number 1 digit + 1 digit, No Carry
- Addition - Whole Number - Add Single Digit to Multiple of Ten
- Addition - Whole Number - Add 10 to a Number
- Addition - Whole Number - Add Multiple of 10 to a Number - Column
- Base 10 Blocks - Counting - Picture to Number - Tens and Ones
Units Teaching This Skill
These adaptive units introduce, teach, or reinforce this skill (Add a 1-digit number to a 2-digit number without regrouping) through scaffolded problems that grow in difficulty as concepts are understood.