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Chapter 2.1
Adding with 3 numbers up to 20
What You'll Learn
Add three single-digit or multi-digit numbers with sums up to 20
Apply addition strategies to combine three addends efficiently
Recognize that numbers can be added in any order to reach the same sum
Build fluency with mental math by grouping numbers that make 10
What You'll Practice
1
Solving three-number addition problems with sums up to 20
2
Adding combinations of single-digit numbers
3
Computing sums using both horizontal and vertical formats
Why This Matters
Adding three numbers builds your mental math skills and number sense, which you'll use daily when counting money, keeping score in games, or solving more complex math problems in school and real life.
This Unit Includes
Practice exercises
Skills
Addition
Three Addends
Mental Math
Number Sense
Basic Operations
NY Curriculum Aligned
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