# 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 66 +   34   = 100 --------- Page Break-------------

 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 --------- Page Break-------------

 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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## 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.