Here is a big square, and this whole square stands for one — one whole. Now look: it has been shared into a hundred tiny little squares. If the whole square is worth one, what do you think just one of those tiny squares is worth?

Hands up with your best guess before we find out.

Look at these three shaded hundred-squares. See how much of the whole is covered each time, and how we write it as a fraction and as a decimal. Notice that ten tiny squares fill one whole row.

Today we explore the hundred-square whole together on the board. We will shade these amounts one after another and read each one aloud as a fraction and as a decimal: first one hundredth (0.01), then five hundredths (0.05), then one whole row as one tenth (0.10), and finally seven hundredths (0.07).

Each time, before we check, show me with your thumb: thumbs up if it is a tiny hundredth-sized piece, thumbs to the side if it is a bigger tenth-sized row.

Today we work through these shadings together, one at a time: shade 0.01, then 0.03, then one whole row as 0.10, and finally 0.12. That last one is the tricky one — it is one whole row plus two more tiny squares, so we will say each part aloud before we check it.