Do the four moves live with a real paper triangle if you have one, or on the board. Take three hands-up answers for the naming, not open call-outs.

Hold out for the odd-one-out — the enlargement changes the shape's size, the other three don't. Don't confirm it; you want the class chasing that all lesson.

Slide, flip, turn are light review — run them briskly. Point along the grid for the slide: same distance, same direction, every corner.

Each time ask what changed: slide changes only position; flip and turn change only the way it faces; size never changes.

Enlarge is the load-bearing move and the odd one out. Hold the reveal — get predictions for both sides and area first.

Many will say the area doubles. Count the grid squares on the enlarged copy together so they see it is four times as big.

Use the enlarged copy on the grid as the 'why': sides double in both directions, so area is 2 x 2 = 4 times as big. Give this a real beat, the wrap depends on it.

Talk this one through together — pupils take turns at the board and the class agrees or corrects out loud. The watching class predicts what stays the same and what changes before each reveal.

Reset to the starting triangle before each move — the four moves do not chain onto one another, so the enlargement is applied to the original and stays on the visible grid. Run them in order: translate 4 right 1 down, reflect across the vertical line, rotate a quarter turn about the corner, enlarge by 2.

The enlargement is the beat to slow down on — get the class to say sides ×2 and area ×4 before you confirm it.

This is the practice round — pupils take turns at the board, check each answer, and the class confirms before moving on. Keep the board work brisk rather than over-explaining.

The last round combines two moves — pupils will want to rush. Ask which move to do first and why before anyone touches the board.