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A millimetre is a fixed distance, whereas a decimal is a way of writing a value. The question is like asking if a foot is bigger than a fraction. A foot may be bigger than a fraction of a yard or a mile, but it is certainly not bigger than a proper fraction of an inch.
4 times as big, or 3 times bigger
The circumference of a circle is 3.14159… times, or pi times bigger than its diameter.
It is 100 times smaller because: 4500/45 = 100
One thousand times smaller. Unless you are using the long scale when it is 1 million times smaller.