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3rd Grade Math
12. 3.NBT.A.3
12.3 Simplifying Addition by Making 10s
Simplifying Addition by Making 10s
Discover how the make a ten strategy turns awkward addition problems into simple ones by regrouping numbers around friendly tens.
What You'll Learn
Identify how much an addend needs to reach the next ten before adding anything else
Split the second addend into two friendly parts so one part completes a ten
Apply the pattern \( a + b = (a + c) + (b - c) \) where \( a + c = 10 \) or another multiple of ten
Rebuild the total by adding the completed ten to the leftover part
Use the strategy with two digit numbers by making the next multiple of ten instead of just ten
Compare making 10s to separating and mental strategies to choose the fastest method for a problem
What You'll Practice
1
Finding number pairs that add up to 10
2
Breaking apart numbers to create tens
3
Solving addition problems using the make-ten method
Why This Matters
Making tens is a powerful mental math strategy that helps you add faster and more accurately. By learning to recognize number combinations that form 10, you'll build a strong foundation for adding larger numbers and solving complex problems with confidence.
This Unit Includes
4 Video lessons
Practice exercises
Learning resources
Skills
Addition
Number Sense
Mental Math
Number Bonds
Decomposing Numbers
Place Value
OH Curriculum Aligned