Elementary Test Prep: Math 4- Grades 1-2 Using a Number Line

A number line can be used to help you add or subtract.

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Remember when you add you count on and get a bigger number. When you subtract, you count back and get a smaller number.

Look at the number line. Notice that the value of the numbers get bigger when you go

from left to right

and the value of the numbers gets smaller when you go

from right to left

When you add, you move from left to right.

When you subtract, you move from right to left.

For example:

Steps to solving the problem

1. Remember that when you add using a number line you move
move from left to right. You are counting on.

2. Put your pencil above the first number in the addition
sentence.

3. Since the problem is 2 + 3. You need to start at the 2 and
move your pencil over 3 times.

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4. The number your pencil lands on is the answer.

2 + 3 = 5

Steps to solving the problem

1. Remember, when you subtract using a number line you move your pencil from right to left. You are counting back or moving toward the smaller numbers.

2. Put your pencil on the first number (5) in your subtraction
sentence. (5 - 3)

3. Move your pencil back 3 numbers. (5 - 3)

4. The number your pencil lands on is the answer.

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5 - 3 = 2