Just 1.
Other than the number 1, there are no positive integer common factors of 10 and 21.
The Greatest Common Factor (GCF) is: 1
No, 21 over 10 can not be simplified any farther because there is no common factor between 10 and 21 (other than one).
The Least Common Multiple of 10, 18, 21 is 630.
The factors of 21 are:1, 3, 7, 21The factors of 350 are:1, 2, 5, 7, 10, 14, 25, 35, 50, 70, 175, 350The common factors are:1, 7
The factors of 21 are 1, 3, 7, and 21. The factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30. The common factors are 1 and 3. The greatest common factor is 3.
The common factors of 21 and 51 are: 1 and 3
The common factors of 21 42 and 84 are 21
The common factors of 21 and 63 are 1, 3, 7, and 21
The factors of 21 are 1,3,7, and 21. The factors of 70 are 1,2,5,7,14,35, and 70 The common factors of 21 and 70 are 1 and 7.
Factors of 10: 1, 2, 5, 10Factors of 21: 1, 3, 7, 21GCF (10, 21) = 1
The factors of 21 are 1, 3, 7 and 21. For them to be common, they need to be compared to another set of factors.