It is: 35
35
2.5
840
0.6 as a fraction is 6/10, six tenths, or six over ten. Then, you want to find a number that both the numerator and the denominator can be divided by. That number is 2. Divide both numbers by 2 and you will have 4/5. Since there aren't any other numbers that can divide into both 4 and 5, 6/10 in its lowest form is 4/5.
31
The largest number that can be divided by both 18 and 45 is 9. 18 divided by 9 is 2 and 45 divided by 9 is 5.
You divide each number by a number that can go into both of the numbers evenly. Say a fraction is 15/20, you can divide both numbers by 5. So it would be 3/4. So 15/20 = 3/4. 15/18 divided by 3 you get 5/6 which is the lowest term.
Factor them both. 1 x 5 = 5 1 x 7 = 7 Discard the common factor (1) and combine the remaining ones 5 x 7 = 35 35 is the lowest (least) number that both 5 and 7 will go into evenly.
40.
2 x 3 x 5 = 30
There will be an infinite amount of numbers that can be divided by 5 and 9. The lowest one (Lowest Common Multiple) is 45.
The 2 numbers 5 and 90 can be divided by that they have in common is the number 1 and the number 5. 5 / 1 = 5 90 / 1 =90 5 / 5 = 1 90 / 5 = 18