# Composing and Decomposing Numbers with Dot Cards: Print and Digital

PreK - 2nd
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Standards
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• PDF
The Teacher-Author indicated this resource includes assets from Google Workspace (e.g. docs, slides, etc.).

### Description

Making (composing) and breaking apart (decomposing) numbers in many different ways is an important component of number sense. In this activity, students see how many ways they can create a target number by combining dot cards.

Includes teacher instructions, recording sheet, label for workstation envelopes, and dot cards. A digital version for use with Google Slides has movable dot cards for working within 10 or 20.

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### Standards

to see state-specific standards (only available in the US).
Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 - 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).
Fluently add and subtract within 5.
Decompose numbers less than or equal to 10 into pairs in more than one way, e.g., by using objects or drawings, and record each decomposition by a drawing or equation (e.g., 5 = 2 + 3 and 5 = 4 + 1).
Represent addition and subtraction with objects, fingers, mental images, drawings, sounds (e.g., claps), acting out situations, verbal explanations, expressions, or equations.