Build Your Own Ruler

Line up one-inch tiles to make a ruler, then compare it with a real ruler.

Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.

What children learn in Level 38

How long is this crayon? Let's measure it with tiles. Each square tile is exactly 1 inch long.
Your turn! Tap to line up inch tiles under the pencil, end to end.
The pencil is 6 tiles long. That means it's 6 inches long!
Be careful! If the tiles have gaps between them, you count too few. Tiles must touch, with no gaps and no overlaps.
If you write a number at the end of each tile, you've made a ruler! The numbers count the inches.
A real ruler works the same way. Most rulers are 12 inches long. 12 inches is called 1 foot.

Georgia's K-12 Mathematics Standards:

2.MDR.5.1 — Construct simple measuring instruments using unit models. Compare unit models to rulers.