**Ohio Education Standards**. Count forward by 1 or count backwards by 1. Read More...

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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: Computation and Estimation: Demonstrate fluency in addition facts with addends through 9 and corresponding subtractions; e.g., 9 + 9 = 18, 18-9 = 9.

NNSO.12. Grade Level Indicator: Computation and Estimation: Demonstrate multiple strategies for adding and subtracting 2- or 3-digit whole numbers, such as:

NNSO.12.a. Compatible numbers.

NNSO.12.b. Compensatory numbers.

NNSO.6. Grade Level Indicator: Meaning of Operations: Model, represent and explain subtraction as comparison, take-away and part-to-whole; e.g., solve missing addend problems by counting up or subtracting, such as 'I had six baseball cards, my sister gave me more, and I now have ten. How many did she give me?' can be represented as 6 + ? = 10 or 10 - 6 = ?.

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

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.5. Grade Level Indicator: Use Algebraic Representations: Understand equivalence and extend the concept to situations involving symbols.

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