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1st Grade Math
8. 1.OA.D.8
8.1 Addition with regrouping up to 20
Addition With Regrouping Up to 20
Learn how addition with regrouping up to 20 works using the make-a-ten strategy, place value charts, and simple worked examples.
What You'll Learn
Recognize when two numbers add up to more than 10 ones and need regrouping into a ten
Apply the make-a-ten strategy by splitting one addend to complete the other up to 10
Use a place value chart to show 1 group of ten and the leftover ones after regrouping
Write sums like \( 8 + 7 = 15 \) as 1 ten and 5 ones instead of 15 loose ones
Check answers by re-grouping ones back into tens and ones to confirm the total is correct
Practice regrouping with numbers up to 20 to build fluency before moving to larger sums
What You'll Practice
1
Adding two single-digit numbers with sums between 11 and 20
2
Regrouping ones into tens when the sum exceeds 10
3
Solving addition problems that require carrying
Why This Matters
Addition with regrouping is a foundational skill you'll use every day, from counting money to solving complex math problems. Mastering this concept now builds the mental math skills you need for multi-digit addition, subtraction with borrowing, and all future arithmetic.
This Unit Includes
1 Video lesson
Practice exercises
Learning resources
Skills
Addition
Regrouping
Carrying
Place Value
Mental Math
Number Sense
OH Curriculum Aligned