Missing addends - sum 20 or less
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Free printable Missing addends - sum 20 or less worksheets for 1st grade. Students find missing addends in equations with sums up to 20, extending algebraic reasoning into the teen number range. Supports the full scope of 1st grade addition and subtraction standards. Part of our addition worksheets collection.
What You'll Learn
- Find the missing addend in equations with sums up to 20
- Solve for an unknown number when the total is 20 or less
- Use addition and subtraction relationships to find missing addends
FAQ
How do missing addend problems with sums to 20 differ in difficulty from those with sums to 10?⌄
Teen sums require students to bridge across ten when counting on, adding the cognitive challenge of place value to the algebraic reasoning task.
Is finding a missing addend with sums to 20 explicitly required by 1st grade standards?⌄
Yes — CCSS 1.OA.D.8 requires students to determine the unknown whole number in an addition or subtraction equation within 20.
What scaffolds help students who struggle with missing addends in the sum-to-20 range?⌄
Number lines and ten frames allow students to see the gap between the known addend and the sum, making the missing piece visible and countable.
Ratings & Reviews
3Sarah K.
Kindergarten Teacher · Verified download
So excited for this to be ready! My students really need more practice with this topic.
Helpful · 11
Tom B.
Learning Specialist · Verified download
This will be a great addition. I already recommend ClassWeekly to all the families I work with.
Helpful · 10
Priya N.
Kindergarten Teacher · Verified download
This is going straight into my lesson plans the second it drops. Please prioritize this one!
Helpful · 13
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