What are the highest common factors of 490 and 1750?

To find the highest common factor (HCF) of 490 and 1750, you can first list the factors of each number. The factors of 490 are 1, 2, 5, 7, 10, 14, 35, 70, 98, 245, and 490. The factors of 1750 are 1, 2, 5, 7, 10, 14, 25, 35, 50, 70, 125, 175, 250, 350, 875, and 1750. The common factors between the two lists are 1, 2, 5, 7, 10, 14, and 35. Therefore, the highest common factor of 490 and 1750 is 35.