📏 Measurement

Units of Length

• Inch (in) — about the length of your thumb tip. Good for small objects.
• Foot (ft) — 12 inches. About the length of a ruler. Good for rooms and height.
• Yard (yd) — 3 feet = 36 inches. Good for fabric or football fields.
• Centimeter (cm) — about the width of your fingernail. Metric small unit.
• Meter (m) — 100 cm. About the height of a doorknob from the floor.

How to Use a Ruler

1. Line up the 0 end of the ruler with the start of the object
2. Read where the object ends on the ruler
3. That number is the measurement in the unit shown