The numbers 2 and 7 go evenly into 42 and 70.
One.
42 twice
The HCF of 18 and 42 is 6
1, 2, 3, 6, 7, 9, 14, 18, 21, 42, 63, 126.
There is no integer that goes into 125 three times evenly. 53 = 125 but that is NOT going "into 125 3 times evenly". 5*3 = 15, not 125.
11
The common factors are: 1, 3
The HCF of both numbers is 6
There is an infinite number of common multiples for 18 and 42. A common multiple of any two numbers is any number into which each of two or more numbers can be divided evenly (zero remainder).
The factors of 42 are: 1, 2, 3, 6, 7, 14, 21, and 42.
8 does not divide 42 evenly so 42/8 is not a whole number.