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Note: If students cannot readily break up or build numbers (e.g. see 5 as being 2 + 3) then they may struggle when using adding and subtracting strategies (e.g. viewing 8 + 5 as 8 + 2 + 3 = 10 + 3 = 13).  
The number 8 can be made using two other numbers. Draw blobs (or any shapes you like) to show how these two numbers make up 8. The first one is done for you.

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The various resources listed below are aligned to the same standard, (KOA03) taken from the CCSM (Common Core Standards For Mathematics) as the Addition and subtraction Worksheet shown above.
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).
Similar to the above listing, the resources below are aligned to related standards in the Common Core For Mathematics that together support the following learning outcome:
Understand addition as putting together and adding to, and understand subtraction as taking apart and taking from