Home > Mathcasts Library > By Grade Level > 1st Grade > 1st Grade Number Sense > 1 NS 1.3
1NS1.3 Represent equivalent forms of the same number through the use of physical models, diagrams, and number expressions (to 20) (e.g., 8 may be represented as 4 + 4, 5 + 3, 2 + 2 + 2 + 2, 10 -2, 11 -3).
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