**South Dakota 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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SD.1.A. Algebra: Students will use the language of algebra to explore, describe, represent, and analyze number expressions and relations that represent variable quantities.

1.A.2. Use a variety of algebraic concepts and methods to solve equations and inequalities.

1.A.2.1. Comprehension: Students are able to use the concepts and language of more, less, and equal (greater than and less than) to compare numbers and sets (0 to 20).

1.A.2.1.b. Write the words less than or more than between two numbers.

1.A.2.1.c. Identify a number that is more than/less than a given number.

SD.1.N. Number Sense: Students will develop and use number sense to investigate the characteristics of numbers in a variety of forms and modes of operation.

1.N.1. Analyze the structural characteristics of the real number system and its various subsystems. Analyze the concept of value, magnitude, and relative magnitude of real numbers.

1.N.1.1. Comprehension: Students are able to read, write, count, and order numerals to 50.

1.N.1.1.a. Say the forward and backward number word sequences in the range 0-50.

1.N.1.1.b. Say the number before and after a given number in the range 0-50.

1.N.1.1.c. Use one-to-one correspondence.

1.N.1.1.f. Count objects in a given set and write the corresponding numeral.

1.N.2. Apply number operations with real numbers and other number systems.

1.N.2.1. Application: Students are able to solve addition and subtraction problems with numbers 0 to 20 written in horizontal and vertical formats using a variety of strategies.

1.N.3. Develop conjectures, predictions, or estimations to solve problems and verify or justify the results.

1.N.3.1. Application: Students are able to solve addition and subtraction problems up to 20 in context.

1.N.3.1.a. Represent problem situations and solve using concrete objects, pictures, or numbers.

1.N.3.1.b. Explain how one arrives at solutions to problems.