**Missouri 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 keyWhole Numbers

MO.A. Algebraic Relationships

A.3. Use mathematical models to represent and understand quantitative relationships.

A.3.A. Use mathematical models

A.3.A.1. Model situations that involve the addition of whole numbers, using pictures, objects or symbols (DOK 2; MA1 1.6)

MO.N. Number and Operations

N.1. Understand numbers, ways of representing numbers, relationships among numbers and number systems.

N.1.A. Read, write and compare numbers

N.1.A.1. Read, write and compare whole numbers less than 100 (DOK 1; MA5 1.10)

N.2. Understand meanings of operations and how they relate to one another.

N.2.A. Represent operations

N.2.A.1. Represent/model a given situation involving addition and subtraction of whole numbers using pictures, objects, or symbols (DOK 2; MA1 1.10)

N.3. Compute fluently and make reasonable estimates.

N.3.A. Describe or represent mental strategies

N.3.A.1. Describe or represent the mental strategy used to compute addition and subtraction problems (DOK 2; MA1 3.2)

N.3.B. Develop and demonstrate fluency

N.3.B.1. Use strategies to develop fluency with basic number relationships of addition and subtraction for sums up to 20 (DOK 1; MA1 1.6)

N.3.C. Compute problems

N.3.C.1. Apply and describe the strategy used to solve addition or subtraction problems (DOK 2; MA1 3.2)