Lesson 0 of 19

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4 min

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The team starts at 0 points. It loses 3, then 4 more. What is its score now?

(−3) + (−4) = −7, walked on a line.

This is Part II, Chapter 2, Operations with Integers. Let's make it easy first.

What you will learn

In this track, a move is one walk along a number line.

Add two negatives. Both moves go the same way.
Add mixed signs. One move each way. The bigger move decides which side of 0 the answer is.
Take away, as an add. One rule instead of two.
Multiply and share. The same move, repeated or undone.
What zero does. Four jobs, and one it cannot do.
Where we use it. A thermometer, a lift, a score.
Zero pairs. Tokens (small counters) that cancel. Then you can take away any number.
Additive inverse. The partner that adds back to zero.
Many factors. Count the negatives to find the sign.
A bracket. Multiply each part, then add.

Every teaching lesson has a lab. Tap or slide. Watch what moves.

If you are unsure about negative numbers, revisit them first.