Watch me change a shape in four ways, one after another. First I slide it across the desk. Then I flip it over. Then I turn it. Then I make it bigger.

The interactive shows the end result of four moves on the grid: a slide, a flip, a turn, and an enlargement. For the first three, look at the shape and its copy together and notice what stays the same and what changes. Before you look at the fourth copy, say what you think will happen to the sides and what will happen to the area.

Now we try the four moves ourselves. Each move starts fresh from the same triangle, so we always go back to the start before the next one. First we slide it 4 right and 1 down. Then we flip it across a vertical mirror line. Then we turn it a quarter turn about a corner. Last, we enlarge it by scale factor 2.

Now we match the triangle to a dashed target outline, one round at a time. The rounds are:

• slide
• flip
• turn
• enlarge by 2
• slide, then turn (two moves in a row)