The GCF of 2 numbers can be less than either number.
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144, 121 and 100
The LCM for any pair of natural numbers can be as big as their product.
Always equal to or less than the smaller number, yes.
There are 10 numbers less than 101 which have an odd number of factors: 1,4,9,16,25,36,49,64,81,100.
All but the square numbers - 53 of them.