Stacking blocks in sequence

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Date:

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Quick Questions

Shade in the A or B circle for each question.

1. A script has these blocks stacked: say Hello! for 2 seconds, then move 10 steps. Which block runs first?

A move 10 steps

B say Hello! for 2 seconds

2. How do you join a new block to a script?

A Drop it far away from the script

B Snap it under the block above it

3. Which statement is true about a stack of blocks?

A The order of the blocks changes what the sprite does

B The order of the blocks never matters

4. You want a sprite to say Ready! and then wait 3 seconds. Which order is right?

A say Ready!, then wait 3 seconds

B wait 3 seconds, then say Ready!

5. What does the wait 2 seconds block do in a stack?

A It pauses the script for 2 seconds before the next block runs

B It makes the sprite move 2 steps

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1move (10) steps		AThere is no wait block between the two say blocks. Without wait (2) seconds the messages change too fast to read.
2wait (1) seconds		BA block that pauses the stack for one second before the next block underneath runs
3Snapping a say block under a move block makes the sprite move first and then speak		CA motion block that runs first in a stack and moves the sprite forward before the next block under it runs
4Reordering blocks so say is on top makes the sprite speak first and then move		DThe blocks are in the wrong order. The say block is on top so it runs first. Drag move above say.
5Stack: say (Time to go!), then move (50) steps. Goal: the sprite moves and THEN says Time to go!		Esay (Hello!) move (10) steps
6Stack: say (Ready?), then say (Go!). Goal: the sprite says Ready?, pauses for 2 seconds, then says Go!		Fmove (10) steps say (Hello!)

Definitions

sequence

Fill in the Blanks

Complete each line of code by filling in the missing parts.

when green flag clicked ____ (10) steps say [Hello!] for (2) seconds

when green flag clicked say [Ready?] for (2) seconds ____ (1) seconds

// Wait 3 seconds, then speak wait (_) seconds say [Hi!] for (2) seconds

when green flag clicked move (10) steps ___ [I moved!] for (2) seconds

when green flag clicked ____ right (90) degrees move (10) steps

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A when green flag clicked

B say 3 for 1 seconds

C say 2 for 1 seconds

D say 4 for 1 seconds

E say Go! for 1 seconds

Question 2

A turn 15 degrees

B move 50 steps

C wait 1 seconds

D say I moved! for 2 seconds

Question 3

A when space key pressed

B wait 1 steps

C say Boo! for 2 seconds

Question 4

A when green flag clicked

B say I'm there! for 2 seconds

C move 100 steps

D say Made it! for 2 seconds

Question 5

A when green flag clicked

B move 10 steps

C when space key pressed

D move 10 steps

Answer Key

Stacking blocks in sequence

Section A: Quick Questions

B — say Hello! for 2 seconds

B — Snap it under the block above it

A — The order of the blocks changes what the sprite does

A — say Ready!, then wait 3 seconds

A — It pauses the script for 2 seconds before the next block runs

Section B: Match the Pairs

move (10) steps → A motion block that runs first in a stack and moves the sprite forward before the next block under it runs

wait (1) seconds → A block that pauses the stack for one second before the next block underneath runs

Snapping a say block under a move block makes the sprite move first and then speak → move (10) steps say (Hello!)

Reordering blocks so say is on top makes the sprite speak first and then move → say (Hello!) move (10) steps

Stack: say (Time to go!), then move (50) steps. Goal: the sprite moves and THEN says Time to go! → The blocks are in the wrong order. The say block is on top so it runs first. Drag move above say.

Stack: say (Ready?), then say (Go!). Goal: the sprite says Ready?, pauses for 2 seconds, then says Go! → There is no wait block between the two say blocks. Without wait (2) seconds the messages change too fast to read.

Section C: Definitions

sequence — Blocks snapped under one another run from top to bottom, one at a time, so the order of the blocks changes what the sprite does.

Section D: Fill in the Blanks

when green flag clicked
move (10) steps
say [Hello!] for (2) seconds

when green flag clicked
say [Ready?] for (2) seconds
wait (1) seconds

// Wait 3 seconds, then speak
wait (3) seconds
say [Hi!] for (2) seconds

when green flag clicked
move (10) steps
say [I moved!] for (2) seconds

when green flag clicked
turn right (90) degrees
move (10) steps

Section E: Spot the Error

D — Blocks run from top to bottom, so the countdown must go 3, 2, 1, Go!. Line 4 should be 'say 1 for 1 seconds'. A 4 in the wrong place breaks the order.

A — A script needs an event block at the top to start it. Line 1 should be 'when green flag clicked', so the blocks below it run when the flag is clicked.

B — The wait block counts in seconds, not steps. Line 2 should be 'wait 1 seconds' so the sprite pauses before it says Boo!.

B — The sprite would say it has arrived before it has moved. Blocks run top to bottom, so line 2 should be 'say I'm off! for 2 seconds' and the arriving message belongs after the move.

C — An event block can only go at the top of a stack. In the middle it cuts the sequence in two. Line 3 should be 'turn 90 degrees' so the blocks run one after another.