Create your own centimeter ruler. Then, estimate and measure with lengths with it. Warm up with a Mystery Math Mistake as you add two 2-digit numbers using a decomposition strategy. Think through ...

That's true, you can use a ruler. You can use it in centimeters or inches, or even measure with different tools as a standard measurement of units.

Centimeter markings are ideal, but it’s OK if you don’t have a metric ruler or tape. Just be sure to multiply each measurement in inches by 2.54 to get the equivalent number in centimeters.

Learn how to change Ruler unit in Word, Excel, PowerPoint from default inches to cm, mm, points, picas via Settings, Registry or Group Policy Editor.