CCSS Math:

K.NBT.1
K.NBT.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.

This Numbers and Operations in Base Ten lesson focuses on decomposing numbers 11 to 19. As prerequisites, students should be able to write numbers from 0 to 20 (K.CC.3), and understand the relationship between numbers and quantities (K.CC.4). The lesson includes research-based strategies and strategic questions that prepare students for assessments.

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### Standard Alignments:

CCSS Math:

K.NBT.1
K.NBT.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.

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