In Topic B, students advance to a more abstract level, representing the decomposition of teen numbers first with Hide Zero cards (Place Value cards) and in Lesson 2 with number bonds. They then work from the abstract to the concrete and pictorial in Lessons 8 and 9 as they are directed to “show (and in Lesson 9 draw) me this many cubes (as teacher displays 13).” Application problems in Topic B are experiences with decomposition and composition of teen numbers (K.NBT.1) rather than word problems (1.OA.2). For example, in Lesson 6, the problem reads, “Gregory drew 10 smiley faces and 5 smiley faces. He put them together and had 15 smiley faces. Draw his 15 smiley faces as 10 smiley faces and 5 smiley faces.” In this instance, there is no unknown. We do not ask, “How many in all?” or “How many?” within a word problem setting. The students represent 15 with their Hide Zero cards both when the zero is hiding and when it is not hiding as they apply all their experiences from Topic A to deeply understand the meaning of the digit 1 in the tens place in teen numbers.
Kindergarten Mathematics Module 5, Topic B
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