Nowhere in the standard is it required for the teacher to use place value language (as Walle and Lovin discourage) but to make representations of the teen numbers using objects and drawings. According to the standard, children should compose and decompose a number in the teens into a group of tens and some ones. Let's dissect this standard to figure out exactly what it is and what it is not asking you to evaluate. The following standard requires unitizing:Ĭ.NBT.A.1 Compose and decompose numbers from 11 to 19 into ten ones and some further ones, e.g., by using objects or drawings, and record each composition or decomposition by a drawing or equation (such as 18 = 10 + 8) understand that these numbers are composed of ten ones and one, two, three, four, five, six, seven, eight, or nine ones. In kindergarten, the goal is not to formalize unitizing, but to begin to help students see numbers in groupings. The inappropriateness of discussing "one ten and six ones" (what's a one?) does not mean that a set of ten should not figure prominently in the discussion of the teen numbers" (Walle and Lovin 2006). Some would say that it is not appropriate for grade 1 at all. The concept of a single ten is just too strange for a kindergarten or an early first grade child to grasp. That is, prior to a much more complete development of place-value concepts (appropriate for second grade and beyond), children should not be asked to explain the 1 in 16 as representing "one ten". However, the numbers between 10 and 20 are not an appropriate place to discuss place-value concepts. When children see a set of six with a set of ten, they should know without counting that the total is 16. Grouping numbers into tens is especially significant, because "A set of ten should play a major role in children's initial understanding of numbers between 10 and 20. It is an ability they use to see that there is simultaneously 1 chair with 4 legs, to count by 2's with understanding, to hold one number in their head when counting on, or to begin grouping numbers into tens. Unitizing is a child's ability to see numbers in groups.
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