1, 5, 25.
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The number that goes into both 75 and 100 equally is 25. This is because 25 is a common factor of both 75 and 100, meaning it can divide both numbers evenly without leaving a remainder. In mathematical terms, both 75 and 100 are divisible by 25.
Both 25 and 4 are factors of 100 and are square numbers, 25 is 52 and 4 is 22. 100 and 1 are also factors of 100, and are also square numbers: 1 is 12 and 100 is 102.
100
25 + 25 + 25 + 25 = 100
The hcf of both numbers is just 1