Remember: Undo steps down one stair and redo steps back up. Calm first, then fix. Undo has holes: a sent message cannot be pulled back.
Read and answer
Read the story, then answer.
The paragraph that vanishedKofi was writing a story about a dragon who was scared of toast. His little sister Ama zoomed in with a toy rocket, and thunk, it landed on the keyboard. The whole paragraph was gone! Mom said, calm first, then fix. Kofi lifted his hands off the keys. Mom showed him undo, which takes back the last thing you did, and the paragraph came back. Think of a staircase, where each thing you do is one stair. Undo steps down one stair, and redo steps back up one. Kofi tapped undo again and again, and the paragraph got shorter and shorter, because he had gone down too many stairs. He tapped redo twice, and the paragraph was whole again. But undo is a safety net with holes in it. A closed program usually forgets its steps.
1
The paragraph has vanished! What does Kofi's mom say to do first?
type it all againstop and lift your hands off the keysclose the program
2
Kofi tapped undo too many times and the paragraph got too short. What brings a step back?
backspacetyping it all overredo
3
Undo can pull back a message that was already sent.
TrueFalse
Up and down the stairs
4
Kofi is on stair 4. He taps undo two times. Which stair is he on?
stair 1stair 2stair 3
5
Now Kofi taps redo one time. He is on stair .
6
Join each key or button to its job.
1undo
2redo
3backspace
Arubs out the letter you just typed
Btakes back your last step
Cbrings a step back again
7
Hold Control and tap the blue key on this kind of keyboard. What does it do?
copiesundoes the last stepsaves
8
Which blue key rubs out the one letter you just typed?
entertabbackspace
9
Circle every one that undo can usually help with.
a paragraph deleted by mistakea message that was already senta picture dragged out of placea program closed without savinga word pasted out of place
10
The paragraph is gone! Number what to do, from first to last.
Tap undo once
Stop and lift your hands
Tap redo if it went too far
Look at the page
11
Fix the mistake: Kit closed the whole program to fix one wrong letter. What fits the job better?
redobackspacetyping the whole page again
Copy and write
12
Copy it. The dragon was afraid of toast.
13
Write what you do, in order, if a paragraph suddenly vanishes. Use the words stop, undo and redo.
Scan the code at the top to mark this sheet on screenTake a photo of your answers or type them. It is marked for you automatically, and your score is kept.
Answer key · Set A
The undo staircase
1stop and lift your hands off the keys Calm first, then fix. So far nothing was lost.
2redo Redo steps back up the staircase, one step each tap.
3False A message that is already sent cannot be pulled back. Undo is a safety net with holes in it.
4stair 2 Undo steps down one stair each tap, so from stair 4 two taps land on stair 2.
53 Redo steps back up one stair. From stair 2 that is stair 3.
61-B, 2-C, 3-A Undo takes back a whole step, redo brings it forward again, and backspace rubs out one letter.
7undoes the last step Control and the Z key take back the last step. Control and the C key copy and Control and the S key save. Ask a grown-up if your computer uses another key.
8backspace Backspace rubs out the letter you just typed. Tab jumps along, and enter starts a new line.
9a paragraph deleted by mistake, a picture dragged out of place, a word pasted out of place Undo can usually take back a deleted paragraph, a dragged picture or a paste. A sent message is gone, and a closed program forgets its steps.
102, 1, 4, 3 Calm comes first. Then undo once, look, and redo if you went down too many stairs.
11backspace For one letter that is off, backspace rubs it out. Closing the program is far too big a fix.
13Your own words: a grown-up reads it.
Mark each answer, count the right ones and write the score on the sheet.