The number 5.
55 goes into 20, 4 times.5 goes into 75, 15 times.
The hcf of 15 and 20 is 5
5 and 4 because -5-4 = -9 and -4*-5 = 20
15/5=3 100/5=20
1 and 5.
1 because a factor is a number that goes into a nother number and 1 is the highest number \
2, 4, 5, 8, 10, 20
These numbers go evenly into 20: 1, 2, 4, 5, 10, 20.
The greatest common factor (or highest common factor) is the highest number that divides exactly into two or more numbers. 20: 1, 2, 4, 5, 10, 20 30: 1, 2, 3, 5, 6, 10, 15, 30 The highest common factor of 20 and 30 is 10.
The greatest or highest common factor is the highest number that divides exactly into two or more numbers. 20: 1, 2, 4, 5, 10, 20 45: 1, 3, 5, 9, 15, 45 The greatest common factor for 20 and 45 is 5.
The simplest form is 1 over 4 the way you do this is you find the greatest number that goes into both which is 5, 5 goes into 5 once which gets us the one and it goes into 20 four times giving us the 4