Big Ideas Math: Modeling Real Life, Grade 7
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Big Ideas Math: Modeling Real Life, Grade 7 View details
3. Identifying Proportional Relationships
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Exercise 7 Page 200

Subtracting can be thought of as going left on the number line.

-18

Practice makes perfect
Below we will demonstrate by finding -10 and moving 8 units to the left on the number line.

The resulting position, after moving to the left on the number line, is the sum. -10-8 = -18