They are: 2.001, 2.01 and 2.1
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1, 3, 7, 21
To write the sum of one hundred and eighty and twenty-one in figures, you would add 180 and 21 together. The sum of 180 and 21 is 201. Therefore, in figures, the sum of one hundred and eighty and twenty-one is 201.
The factors of 42 are: 1, 2, 3, 6, 7, 14, 21, 42
If you want the "greatest", then there can only be one of it.You can't have two different numbers and say that they'reboth the "greatest".The greatest common factor of 12 and 21 is 3 .
The GCF is 7.