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1st Grade Math
12. 1.NBT.C.4
12.10 Using models to add up to 100
Using Models to Add Up to 100
Discover how base ten blocks and place value models make adding two-digit numbers up to 100 easier, including regrouping tens and ones.
What You'll Learn
Represent each two-digit addend using tens rods and ones cubes to build a base ten block model
Combine the tens rods and ones cubes from both addends into one large group
Regroup ten loose ones cubes into one new tens rod whenever the ones total reaches ten or more
Apply the model to solve \( 34 + 28 = 62 \) by counting the final tens and ones after regrouping
Check the block model answer against a hundred chart or number line to confirm the total
Recognize that models make regrouping visible before switching to purely numeric addition steps
What You'll Practice
1
Counting tens and ones from base-ten block diagrams
2
Adding two-digit numbers using visual block models
3
Combining blocks to find sums up to 100
Why This Matters
Using block models helps you visualize how addition works with larger numbers. This hands-on understanding of place value builds the foundation for mental math strategies and prepares you for adding even bigger numbers without needing to count every single unit.
This Unit Includes
1 Video lesson
Practice exercises
Learning resources
Skills
Place Value
Addition
Base-Ten Blocks
Visual Models
Tens and Ones
OH Curriculum Aligned