No, 10mm is not bigger than 45. This depends entirely on the units of the 45.
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If the 45 is also in millimeters (mm): Then 10mm is significantly smaller than 45mm. 45mm is 4.5 times larger than 10mm.
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If the 45 represents a different unit: If the 45 represents centimeters (cm), then 45cm is equal to 450mm, making it much larger than 10mm. Similarly, if the 45 represents any other larger unit of length (meters, kilometers, etc.), it will be substantially larger than 10mm.
Therefore, to accurately compare the two, you must know the units of measurement for both values. Without knowing the units of the 45, it's impossible to say definitively whether 10mm is bigger.
