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Lesson 8 · Workbook p. 71

The Number Line and Opposites

Playback speed:
Ana walks 5 blocks west. Ben walks 5 blocks east. And what is −(−3)?

In this video

  • Opposites are mirror images: the same distance from 0 on opposite sides.
  • Place fractions and decimals like −2.5 on the number line.
  • See why the opposite of −3 is 3.

Try it together

−(−9)
Show the answer
9
Read it as “the opposite of the opposite of 9.” Flipping twice brings you back to 9.

Ask, don't tell

“How far from 0 is it? Which side?”

“What happens when you flip twice?”

The workbook these videos go with

Math for Parents – 6th Grade: Numbers & Operations. Picture-first lessons, “Ask, don't tell” prompts on every page, worked examples, real-world missions, and answer keys with coaching notes, so you can help even if it's been years since you learned it.

Get the workbook on Amazon