• How to create a number line    8-27-2018

1. Draw a line with arrows on both ends (horizontal or vertical)
2. Add the ticks or slashes in the line about 20 for today’s examples
3. Place a 0 in the middle and number the number line by 5’s
1. Negative numbers go to the left of 0 for horizontal lines or below 0 for vertical lines
2. Positive numbers go to the right of 0 for horizontal lines or above 0 for vertical lines
4. Plot the points
• How to add and subtract integers using a number line  8-28-2018

1. Create a number line
2. Plot the first number in the expression/ problem
3. Use the sign to determine the direction
1. + (addition) move to the right/ positives
2. – (subtraction) move to the left/ negatives
3. Note: if there are two negative signs, it changes the original direction
4. The 2nd number tells you how many units from the first number you are going
• How to add and subtract integers without a number line  8-29-2018

1. Subtract the numbers and keep the sign of the larger number
2. Examples
1. - p + q
2. p + (- q) = p – q
3. Subtracting integers
1. For a negative number minus a positive number, add the absolute value of the numbers and keep the negative sign.
2. Example
1. – p – q = - p + (- q)
3. For a number minus a negative number, change the subtraction to an addition problem
4. Examples
1. p – (- q) = p + q
2. – p – (- q) = - p + q

Sample problems:

1. (- 1) + 5
2. 5 + (- 3)
3. 7 + 5
4. – 4 + 7
5. 7 + (- 8)
6. (- 6) + (- 3)
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