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Follow these steps to answer the questions below:
The first one is done for you. Use it as an example. 

18 + 5 = 23 
29 + 4 = 33 
39 + 7 = 46 
28 + 8 = 36 
37 + 7 = 44 
78 + 7 = 85 
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Follow these steps to answer the questions below:
The first one is done for you. Use it as an example. 

18 + 5 = 23

68 + 6 = 74 
59 + 8 = 67 
48 + 8 = 56 
89 + 6 = 95 
49 + 5 = 54 
You will find a similar worksheet here that covers bridging through 10. e.g. 8 + 4 = 12
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The various resources listed below are aligned to the same standard, (2NBT05) taken from the CCSM (Common Core Standards For Mathematics) as the Addition and subtraction Worksheet shown above.
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
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:
Use place value understanding and properties of operations to add and subtract