What is the simplest for of 42 divided by 60 in simplest form?

Answer 1

0.7

Answer 2

42/60 = 7/10

Additional Note on How to Solve + Tip:

You have: 42/60 = ??

First you should notice the numbers are even, so you divide both the numerator and the denominator by two (half them):

42/60 = 21/30

Now you should realize both numbers are divisible by 3 (see tip below on how to tell), so you divide both the numerator and denominator by 3:

21/30 = 7/10

The answer is 7/10 as it cannot be further simplified.

Note on finding out if a number is divisible by 3, 6, and/or 9:

Find the sum of all the digits in a number, and keep doing this until you have a single digit (called the digital root):

e.g.: 21 -> 2 + 1 = 3 (so 21's digital root is 3)

30 -> 3 + 0 = 3 (the digital root of 30 is 3)

99 -> 9 + 9 = 81 (needs to be a single digit -- add them again); 8+1=9

• If a number's digital root is equal to 3, 6, or 9 than the number is divisible by 3.
• If a number's digital root is equal to 3, 6, or 9 AND the number is even, then it is also divisible by 6.
• If a number's digital root is equal to 9 than it is also divisible 9.

So in the case above, 21 and 30 both have a digital root of 3, and therefore both are divisible by 3.