Practice: Doing and undoing

Doing and undoing

Warm-upHuman

Mateo opens the door. Which action undoes that?

Choose one

Close the doorOpen the door againOpen the window

Doing and undoing

Warm-upHuman

Rosa takes 4 steps forward. Which action undoes it?

Choose one

4 steps back4 steps forward3 steps back

Doing and undoing

CoreHuman

Which of these actions can be undone? Choose all of them.

Choose all that apply

Doing and undoing

CoreHuman

Which action is undone by doing exactly the same action again?

Choose one

Flip a card overWalk 2 steps forwardTurn an arrow a quarter turnAdd a block to a tower

Doing and undoing

CoreHuman

An arrow points up. You turn it a quarter turn, so it points right. How many more quarter turns, the same way, bring it back to pointing up?

Doing and undoing

CoreFormal

Gideon's game: true or false? "Doing nothing, and then putting on a hat, has the same effect as just putting on a hat."

Choose one

TrueFalse

Doing and undoing

CoreFormal

Gideon's game: true or false? "Every action can be undone."

Choose one

TrueFalse

Doing and undoing

StretchHuman

Why can't wiping the whiteboard be undone?

Choose one

A board with a cat and a board with a dog both become the same blank board, so nobody can tell which picture to bring backBecause drawing a picture takes too longBecause the pen has run out

Doing and undoing

StretchComputational

Margaret's tiny world: a lamp is on or off. She found exactly 4 actions: do nothing, press the switch (on becomes off, off becomes on), always make it on, and always make it off. How many of these 4 actions can be undone?