100 centimeters equals 1 meter. To convert, multiply meters by 100 to get centimeters. For example, 3 meters = 300 centimeters.
When you measured lengths in centimeters, you were using a small unit — about the width of your fingernail. A meter is a much bigger unit: exactly 100 centimeters long. Imagine lining up 100 centimeter marks end-to-end; the whole line would be 1 meter. A meter is roughly the height of a doorknob from the floor, or the length of a baseball bat.
The relationship "100 centimeters = 1 meter" is the only fact you need to convert between them. If you know a measurement in meters, multiply by 100 to get centimeters — because each meter contains 100 centimeters. So 3 meters = 3 × 100 = 300 centimeters. If you know centimeters and want meters, divide by 100. For example, 500 centimeters ÷ 100 = 5 meters.
A useful mental image: think of meters as whole groups and centimeters as the individual pieces inside each group. This is the same place-value thinking you've been practicing. When you go from meters to centimeters, you're "unpacking" each group into 100 pieces, which makes the number 100 times larger. When you go from centimeters to meters, you're "packing" 100 pieces into each group, making the number 100 times smaller.
Watch out for a common mix-up: students sometimes divide when they should multiply, or vice versa. A simple check — centimeters is the smaller unit, so you always need *more* of them to describe the same length. If your answer in centimeters is smaller than your number of meters, something went wrong. For example, 4 meters should give you 400 centimeters, not 0.04. More meters → bigger centimeter number; fewer meters → smaller centimeter number.