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1st Grade Math
8. 1.OA.D.8
8.3 Completing the addition statement up to 10
Completing the Addition Statement Up to 10
Practice finding the missing number in an addition statement up to 10 using number bonds, counting on, and ten frames.
What You'll Learn
Identify the missing addend in a statement like \(4 + ? = 9\) by counting on from 4 to 9.
Apply the part-whole idea that two parts always combine to make the whole, such as \(6 + ? = 10\).
Use a ten frame to see how many more counters are needed to fill it up to 10.
Count on using fingers or a number line to find the unknown number in an addition statement.
Check an answer by placing the missing number back into the statement to confirm both sides match.
What You'll Practice
1
Finding the missing first number in addition sentences
2
Finding the missing second number in addition sentences
3
Completing equations when the sum is given
Why This Matters
Completing addition statements builds your problem-solving skills and prepares you for algebra. Finding missing numbers strengthens your number sense and teaches you to think flexibly about how numbers work together.
This Unit Includes
4 Video lessons
Practice exercises
Learning resources
Skills
Addition
Missing Addends
Number Sense
Fact Families
Mental Math
OH Curriculum Aligned