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Kindergarten Math
11. K.OA.A.4
11.2 Adding or taking one up to 10
Adding or Taking One Up to 10: One More and One Less
Discover an easy way to find one more or one less than any number up to 10 using counting and number lines.
What You'll Learn
Recognize that "one more" means the very next number when counting forward.
Recognize that "one less" means the number right before it when counting backward.
Use a number line to hop one step right for \( 6 + 1 = 7 \) or one step left for \( 6 - 1 = 5 \).
Apply counting on and counting back as quick strategies instead of adding from scratch.
Compare a number to its neighbors to decide whether one more or one less is needed.
Practice building fluency with numbers up to 10 to prepare for larger addition and subtraction.
What You'll Practice
1
Counting animals and objects in visual sets
2
Finding the number that is one more than a given amount
3
Finding the number that is one less than a given amount
Why This Matters
Learning to add or subtract one is your first step into understanding how numbers work together. This skill builds the foundation for all future addition and subtraction, helps you count forward and backward confidently, and prepares you for mental math strategies you'll use every day.
This Unit Includes
Practice exercises
Learning resources
Skills
Counting
Number Sense
Addition
Subtraction
Numbers to 10

OH Curriculum Aligned