Missing Addends in Three-Integer Sums
Written by Adi Ackerman, Head Teacher
"Missing Addends in Three-Integer Sums" is written for 6th Grade (Ages 11-12). If your student is a year younger but already steady on integers, the page still works. You may just need to read the instructions out loud. And if they are older and addition of integers never quite stuck, this is a short review rather than busywork.
6th grade math worksheet: find the missing addend in 20 three-integer sums, such as 3 plus a number plus (−1) equals −5. Answer key included. Part of our addition of integers collection.
How do I use this worksheet?
Start with sums to 10 and a number line, then move to sums to 30 without one. Use the three and four integer pages once students add two integers with confidence, and the missing addend pages to check that they can work backward.
What students will practice
- Students will find the missing addend in 20 sums of three integers.
- Students will combine the two known addends first, as in 4 + (−2) plus a number equals 12.
- Students will solve for missing negative addends such as in (−9) + (−3) plus a number equals −20.
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FAQ
How do I use this addition of integers worksheet?
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Start with sums to 10 and a number line, then move to sums to 30 without one. Use the three and four integer pages once students add two integers with confidence, and the missing addend pages to check that they can work backward.
What does this worksheet teach?
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Find the missing addend in 20 three-integer sums, such as 3 plus a number plus (−1) equals −5. The directions on the page read: Write the missing integer that makes each equation true. An answer key is included.
Can I use this addition of integers worksheet for homeschool or classroom?
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Yes, both. We made it for 6th Grade integers, and the page works the same whether it lands on a kitchen table or a center rotation. At home, most families go through it together and talk the answers out loud, and that talking is where most of the learning happens with addition of integers. In class it runs well as independent work while you pull a small group. Print one copy or thirty, whichever the day needs.
How do you add a positive and a negative integer?
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Subtract the absolute values and keep the sign of the number farther from 0. So 3 + (−5) = −2, because 5 − 3 = 2 and −5 is farther from 0.
How do you add three or four integers?
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Add them two at a time, or add all the positives and all the negatives first and then combine the two totals. For 14 + 8 + 9 + (−20), the positives make 31 and 31 + (−20) = 11.
How do you find a missing addend with integers?
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Subtract the known addend from the sum. If (−19) plus a number equals −12, the missing addend is −12 − (−19) = 7.
Is there an answer key?
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Yes. All 6 addition of integers sheets have an answer key.
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