Factors of 189: 1,3,7,9,21,27,63,189
Factors of 200: 1,2,4,5,8,10,20,25,40,50,100,200
Their only common factor is 1.
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1+1=1 is the GCF of 189 and 200
There are five: 105, 126, 147, 168 and 189.
As the digit in the tens place is an 8, then it rounds up the number to give 200 as the answer.
It goes 189/24 times: a fraction which can be simplified, if required.
63, 126, 189 and so on.