represent addition and subtraction operations. Challenge students to show their understanding of addition and subtraction by using formal number sentences (1 + 2 = 3), tallies, pictures, or number lines drawn on paper.
Story Problems
Use the number line to help students understand basic story problems involving key math language (in all, how many left, total, altogether, more than, less than, etc.).
Example:
Josie read 4 books.
Lucas read 3 books.
How many books did they read in all?
Have a student stand on the number 4 to represent 4 books. Then, discuss ways to solve the problem using the number line (the student steps 3 places to the right for a sum of 7).
Intervention Strategies
Simple Addition: Counting on is a basic way to add a small quantity to a large quantity. For example, to solve 4 + 3, a student can count on three: 5, 6, 7. Have students count on (or back for subtraction) as they step on the line.
Computation: Encourage students to draw their own number lines when working out traditional
Vocabulary: Correct misinterpretations of operational phrases such as “How many left?” to prevent students from confusing them with directional meanings.
Number Sense: Ensure that students are viewing the number line from left to right to prevent confusion during
Measurement: Use number lines to introduce linear measurement, rulers, and standard units.
