225 and all its multiples.
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The lowest number that both 15 and 25 go into is 75. 15 goes into 75 5 times, and 25 goes into 75 three times.
The number that can go into 16 and 49 equally is 1. This is because any number can be divided by 1 without a remainder, making it a common factor of both 16 and 49. In mathematical terms, 1 is a common divisor of 16 and 49.
common factors of both numbers are: 1 and 3
The number 1.
No number will go in 4 and 100 equally, as 100 is 25 times greater than 4 and so any number that goes into both will go 25 times greater into 100 than it goes into 4. However, the numbers which go into 4 and 100 without remainder, ie the common factors of 4 and 100 are: 1, 2, 4