**Ohio Education Standards**. What is a Number Line? Number lines can be used to help with many different ways. The most common ways are for addition and subtraction. Read More...

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Study GuideUsing Number Line

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Worksheet/Answer keyUsing Number Line

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OH.NNSO. Number, Number Sense and Operations: Students demonstrate number sense, including an understanding of number systems and operations and how they relate to one another. Students compute fluently and make reasonable estimates using paper and pencil, technology-supported and mental methods.

NNSO.10. Grade Level Indicator: Meaning of Operations: Model, represent and explain addition as combining sets (part + part = whole) and counting on. For example:

NNSO.10.b. Draw pictures to model addition.

NNSO.11. Grade Level Indicator: Meaning of Operations: Model, represent and explain subtraction as take-away and comparison. For example:

NNSO.11.b. Draw pictures to model subtraction.

NNSO.16. Grade Level Indicator: Computation and Estimation: Develop strategies for basic addition facts, such as:

NNSO.16..e Doubles plus or minus one.

NNSO.16.a. Counting all.

NNSO.16.b. Counting on.

NNSO.16.c. One more, two more.

NNSO.16.d. Doubles.

NNSO.16.g. Using tens frames.

NNSO.17. Grade Level Indicator: Computation and Estimation: Develop strategies for basic subtraction facts, such as:

NNSO.17.b. One less, two less

NNSO.17.c. All but one (for example, 8 - 7, 5 - 4)

NNSO.17.d. Using tens frames.

NNSO.4. Grade Level Indicator: Number and Number Systems: Count forward to 100, count backwards from 100, and count forward or backward starting at any number between 1 and 100.

NNSO.B. Recognize, classify, compare and order whole numbers.

NNSO.F. Count, using numerals and ordinal numbers.

NNSO.G. Model, represent and explain addition as combining sets and counting on.

NNSO.H. Model, represent and explain subtraction as comparison, take-away and part-to-whole.

NNSO.K. Demonstrate fluency in addition facts with addends through 9 and corresponding subtractions.

OH.PFA. Patterns, Functions and Algebra: Students use patterns, relations and functions to model, represent and analyze problem situations that involve variable quantities. Students analyze, model and solve problems using various representations such as tables, graphs and equations.

PFA.D. Model problem situations, using objects, pictures, numbers and other symbols.