Number Bonds To 100. Adding What Number Makes 100?

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

	64 + ___ = 100
Step 1: Put the problem on a number line.
Step 2: What is the gap to the next multiple of 10?
Step 3: What is the gap from there to 100?
Step 4: Add to get the total difference.

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

number line example showing difference between 100 and 27

66 + 34 = 100

blank number line

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

35 + 65 = 100

blank number line

26 + 74 = 100

blank number line

79 + 21 = 100

blank number line

87 + 13 = 100

blank number line

18 + 82 = 100

blank number line

67 + 33 = 100

blank number line

38 + 62 = 100

blank number line

45 + 55 = 100

blank number line

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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

There are more number bond worksheets and activities here.

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An Addition and Subtraction Worksheet - By HelpingWithMath.com

Related Resources

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.