What number will go into 76 and 100?

The greatest common factor (GCF) of 76 and 100 is 4. This is because both numbers can be divided evenly by 4. The factors of 76 are 1, 2, 4, 19, 38, and 76, while the factors of 100 are 1, 2, 4, 5, 10, 20, 25, 50, and 100. Therefore, the common factor that goes into both 76 and 100 is 4.