math 7
unit 2.3 - adding integers on a number line
adding integers
THE SIGN RULES FOR THE ADDING OF INTEGERS
Let's review with some examples:
let's remember what opposite integers mean
adding integers on a number line
take a look at the following examples
1. We ALWAYS start at 0.
2. Since the first integer is positive, the arrow goes to the right. Stop at the correct number.
3. Starting there, we draw the second line. Since this one is negative, it goes towards the left. This one stops at -6.
4. Now notice the distance between the two arrows. Here, it goes from 0 to -2.
2. Since the first integer is positive, the arrow goes to the right. Stop at the correct number.
3. Starting there, we draw the second line. Since this one is negative, it goes towards the left. This one stops at -6.
4. Now notice the distance between the two arrows. Here, it goes from 0 to -2.
1. We ALWAYS start at 0.
2. Since the first integer is negative, the arrow goes to the left. This one stops at -3. 3. Starting there, we draw the second line. Since this one is positive, it goes towards the right. This one stops at +7. 4. Now notice the distance between the two arrows. Here, it goes from 0 to +4. |
1. We ALWAYS start at 0.
2. Since the first integer is negative, the arrow goes to the left. This one stops at -1. 3. Starting there, we draw the second line. Since this one is negative, it goes towards the left. This one stops at -4. 4. Now notice the distance between the two arrows. Since you "added" to the original line, the distance that separates the lines starts at 0 (and it ends in -5).. |
some more examples
using a vertical line
This concept can be used in a "VERTICAL" way, or using a VERTICAL NUMBER LINE:
Let's Practice with some word problems
videos that may help
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Interactive online activities
worksheets
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review - workbook
math_7_-_workbook_-_unit_2.3.pdf | |
File Size: | 2753 kb |
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