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Look at the 4 steps in the example below and then try the questions that follow. 



Follow the steps shown above and mark the 'jumps' and numbers on the number lines to help find the missing number. The first one is done. 

27 + 73 = 100 
66 + 34 = 100

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Follow the examples and steps on page 1 to answer these questions: 

35 + 65 = 100

26 + 74 = 100

79 + 21 = 100

87 + 13 = 100

18 + 82 = 100

67 + 33 = 100

38 + 62 = 100

45 + 55 = 100

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Follow the examples and steps on page 1 to answer these questions: 

56 + 44 = 100

77 + 23 = 100

29 + 71 = 100

48 + 52 = 100

Answer these questions. Try to picture a number line and the steps in your mind to help. 

76 + 24 = 100 
86 + 14 = 100 
36 + 64 = 100 
17 + 83 = 100 
27 + 73 = 100 
47 + 53 = 100 
75 + 25 = 100 
85 + 15 = 100 
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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