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Adding to complete one hundred

Sums of 100 (missing addends)

Students "complete the hundred" by finding the missing addend in these addition equations with two terms and a sum of 100. Students should strive to figure out the answers mentally without writing down intermediary steps.

Grade 3 Addition Worksheet adding to complete one hundred

Worksheet #1 Worksheet #2 Worksheet #3 Worksheet #4
Worksheet #5 Worksheet #6
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Adding whole tens to a 2-digit number Adding a 1-digit number to a 2-digit number with missing addend

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