A variable is a named box that holds a value until a block changes it.
A game has to remember things, like how many apples you caught. It keeps each count in a variable, a box with a name.
A set block puts a value into the box. A change block adds to the value already inside.
A variable keeps its value until a block changes it. It never forgets by itself, and it never starts at zero by itself.
So a game starts with set to zero, under the flag block, to give every new game a fresh start.
These are some of the questions on the sets. The printable sheets have more and an answer key.
6. 5 + 1 = 6.
0. Set puts a new value in the box.
set apples to 0. Change would add to the old number.
No. A block must change it.
The apples box. The basket is a sprite, and it holds no number.
Write apples on a cup and start it empty: set apples to zero. A grown-up says change, and you drop in one pebble. When they say set to zero, you empty the cup. Say how many pebbles are in the box after each step.
Do the Mission: write apples on a cup and start it empty, which is set apples to 0. You say change, and your child drops in one pebble. When you say set to zero, they empty the cup and say how many pebbles are in the box after each step.
