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4th Grade Math
9. 4.NBT.B.4
9.2 Adding with regrouping (using base ten blocks)
Adding with Regrouping Using Base Ten Blocks
See how base ten blocks make regrouping visual: trade ten ones for a ten rod, or ten tens for a hundred flat, while adding multi-digit numbers.
What You'll Learn
Identify ones, tens, and hundreds blocks and connect each shape to its place value before adding.
Add the ones column first, such as \(7 + 5 = 12\), and watch for sums of ten or more.
Trade ten ones blocks for one tens rod whenever the ones column totals ten or greater.
Carry the regrouped ten into the tens column, such as \(2 + 1 + 1 = 4\), to find that digit.
Apply the same trading rule between tens and hundreds when a column like \(6 + 5 + 1 = 12\) tens appears.
Check that the final block count matches the written answer, such as \(27 + 15 = 42\).
What You'll Practice
1
Adding two-digit numbers with regrouping in the ones place
2
Adding three-digit numbers with multiple regrouping steps
3
Solving addition problems that create new place values (e.g., two 2-digit numbers becoming a 3-digit sum)
4
Adding three numbers in a single problem with regrouping
5
Solving word problems involving multi-step addition with regrouping
Why This Matters
Mastering addition with regrouping builds your foundation for all higher-level math. You'll use this skill daily when handling money, measuring ingredients, calculating distances, and solving complex problems in algebra and beyond.
This Unit Includes
11 Video lessons
Practice exercises
Learning resources
Skills
Place Value
Regrouping
Base Ten Blocks
Multi-Digit Addition
Carrying
Visual Models
Word Problems
OH Curriculum Aligned