Math 7 · Unit 3, Lesson 5
Dividing Signed Numbers
Dividing with negatives, and what a rational number is
ElleMath-speak
In this lesson, we divide signed numbers. Division is the inverse of multiplication, so the sign rules for dividing are the same as the sign rules for multiplying.
FinnPlain English
Dividing just undoes multiplying. Same signs, positive. Different signs, negative. You already know this.
Write it down. Do every change on paper, one line per step. Changing signs in your head is the number one reason for missed problems. If you changed something, it should be on the paper.
Go in order. Each tile has a short explanation, then a "Let me try a few" button.
1Multiplying BackwardSame signs, same rulesStart here
2The Fraction Bar Means DivideWhere the negative goes, and what a rational number is
3Fractions and DecimalsFlip and multiply
4Real-World QuotientsSharing costs and finding rates
When you have finished
At the end of each tile you will find a review form to give us feedback.
NC standard: NC.7.NS.2.