Explain why you multiply to change from centimeters to millimeters

We know that a larger quantity has lesser number of objects than the smaller quantity.

For example we know if a distance is 1 km, it shall have 1000 units of meter.

so in 5 km which is 5 times 1 km, there shall be 5 times 1000 units of meter.

That is why when converting from larger to smaller units we multiply.

Now we know centimeter is a larger unit & millimeters is a smaller unit.

So when we need to convert to millimeters from centimeters we need to multiply.

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