Overview
Read
Next Steps
Overview
Mathematical Reasoning
Basic Math
1. Number Sense and Operations
1.9 Adding and Regrouping Place Values
Adding and Regrouping Place Values
Discover how regrouping in addition lets you carry extra ones, tens, and hundreds into the next column, with easy step-by-step examples.
What You'll Learn
Identify when a column's sum reaches 10 or more and needs regrouping into the next place value
Apply the rule that 10 ones make 1 ten and 10 tens make 1 hundred when carrying
Add digits column by column starting from the ones place, carrying extra tens leftward
Record a small carried digit above the next column so you do not lose track of it
Use \( 48 = 40 + 8 \) style expanded form to see why the carried amount equals a full ten
Check your sum by re-adding each column or comparing it to the expanded form of both numbers
This Unit Includes
Learning resources
TEST-PREP Curriculum Aligned