OR.1.1. Number and Operations: Develop an understanding of whole number relationships, including grouping in tens and ones.
1.1.1. Compare and order whole numbers to 100.
1.1.2. Represent whole numbers on a number line, demonstrating an understanding of the sequential order of the counting numbers and their relative magnitudes.
OR.1.2. Number and Operations and Algebra: Develop understandings of addition and subtraction and strategies for basic addition facts and related subtraction facts.
1.2.1. Model ''part-whole,'' ''adding to,'' ''taking away from,'' and ''comparing'' situations to develop an understanding of the meanings of addition and subtraction.
1.2.2. Develop and use efficient strategies for adding and subtracting whole numbers using a variety of models, including discrete objects, length-based models (e.g., lengths of connecting cubes) and number lines.
1.2.3. Apply with fluency sums to 10 and related subtraction facts.