The number is 1.
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3
15/5=3 100/5=20
The number 5 is common to both 15 and 100.
One.
The number that goes into both 77 and 100 is 1. This is because 1 is a factor of every integer, meaning it divides evenly into both 77 and 100 without leaving a remainder. In contrast, other numbers such as 2, 3, 4, etc. do not divide evenly into both 77 and 100.