TOPIC
MY PROGRESS
Pug Score
0%
Best Streak
0 in a row
Study Points
+0
Overview
Practice
Watch
Read
Next Steps
Get Started
Get unlimited access to all videos, practice problems, and study tools.
Unlimited practice
Full videos
Back to Menu
Topic Progress
Pug Score
0%
Videos Watched
0/0
Best Practice
No score
Read
Not viewed
Best Streak
0 in a row
Study Points
+0
Overview
Practice
Watch
Read
Next Steps
Overview
3rd Grade Math
12. 3.NBT.A.3
12.4 Addition with Tens and Ones
Addition with Tens and Ones (Place Value Addition)
Master adding two digit numbers by lining up tens and ones, using base ten blocks to see exactly what regrouping means.
What You'll Learn
Break each two digit number into its tens digit and ones digit before adding.
Add the ones column first, then the tens column, keeping digits lined up by place value.
Represent numbers with base ten blocks, using long rods for tens and small squares for ones.
Regroup by trading ten ones blocks for one tens rod whenever the ones total is 10 or more.
Write the regrouped ten as a small carried digit above the tens column before adding the tens.
Check an answer by re-splitting the sum back into tens and ones to confirm it matches the total.
What You'll Practice
1
Adding two-digit and three-digit numbers by tens
2
Solving addition problems with numbers up to 1000
3
Breaking numbers into tens and ones to simplify addition
Why This Matters
Adding with tens and ones builds your number sense and mental math skills, making everyday calculations faster and easier. This foundational skill prepares you for multi-digit operations, estimation, and problem-solving in all future math courses.
This Unit Includes
1 Video lesson
Practice exercises
Learning resources
Skills
Place Value
Addition
Tens and Ones
Mental Math
Regrouping
Number Sense
OH Curriculum Aligned