Find the H.C.F of the following numbers. 70, 105, 175

Factors of 70 are 1, 2, 5, 7, 10, 14, 35 and 70.
Factors of 105 are 1, 3, 5, 7, 15, 21, 35 and 105.
Factors of 175 are 1, 5, 7, 25, 35 and 175.
∴ Common factors of 70, 105 and 175 are 1,5,7 and 35.
Highest of these common factors is 35.
∴ H.C.F of 70, 105 and 175 is 35.