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Kindergarten - Number Sense and Numeration
Standard K.NSN.7 - Count and compare different groups of objects determining how many more objects are needed to get 10.
demonstrate an understanding of number relationships for numbers from 0 to 10, through investigation (e.g., initially: show smaller quantities using anchors of five and ten, such as their fingers or manipulatives; eventually: show quantities to 10, using such tools as five and ten frames and manipulatives)