3 is a factor of 12 & a factor of 15, so it's a common factor between 12 & 15. Also, as it's the only common factor between them, in addition to 1 of course, it's the highest common factor between 12 & 15.
-12
12 + 3 = 15
3+4x=15 4x=15-3 4x=12 x=12/4 x=3 The check is: If x=3 then, 3+ (4 X 3)=15 3+12=15
4n+3 = 15 15 - 3 = 12 4n = 12 12 / 4 = 3 (3 X 4) + 3 = 15
3
Because 3 is the largest number that divides into both 12 and 15 evenly with no remainder.
1 3/12
12
12.
3, 6, 9, 12, 15.As in the three times table.
45/12 = 15/4 = 3 3/4
15