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Level 4- The student is able to combine and partition numbers in the range of 11 to 20 using the 10-plus aspect of the “teens” and the doubles of 6 through 10. The student may be unable to generate other combinations and partitions in this range. Level 5- The student is able to utilize reference numbers involving the base of 10, the sub-base of 5, and doubles to combine and partition numbers in the range of 1 to 20 without counting. |
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