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1st Grade Math
12. 1.NBT.C.4
12.9 Addition with regrouping up to 100
Addition with Regrouping up to 100
Learn how to add two-digit numbers up to 100 by carrying, or regrouping, extra ones into the tens column with clear steps and examples.
What You'll Learn
Recognize when the ones column adds to 10 or more and a ten must be regrouped into the tens column
Apply the column method: line up ones and tens, add ones first, then tens plus any carried ten
Calculate examples such as \( 48 + 37 = 85 \) by carrying a 1 from the ones place to the tens place
Compare regrouping addition to simple addition without carrying to see why the extra step is needed
Identify common errors, like forgetting to add the carried ten or writing two digits in one column
What You'll Practice
1
Adding two-digit numbers that require regrouping in the ones place
2
Solving missing number problems involving regrouping
3
Computing sums where ones digits add up to 10 or more
Why This Matters
Addition with regrouping is a fundamental math skill you'll use every day, from handling money to measuring ingredients. Mastering regrouping builds your number sense and prepares you for multi-digit addition, subtraction with borrowing, and all future math operations.
This Unit Includes
1 Video lesson
Practice exercises
Learning resources
Skills
Regrouping
Place Value
Two-Digit Addition
Carrying
Mental Math
OH Curriculum Aligned