math help

What is 4/12 - 1/7?

What is 4/12 - 1/7?

Here's how to subtract 1/7 from 4/12:

4
12
1
7

Step 1

We can't subtract two fractions with different denominators. So you need to get a common denominator. To do this, you'll multiply the denominators times each other... but the numerators have to change, too. They get multiplied by the other term's denominator.

So we multiply 4 by 7, and get 28.

Then we multiply 1 by 12, and get 12.

Next we give both terms new denominators -- 12 × 7 = 84.

So now our fractions look like this:

28
84
12
84

Step 2

Since our denominators match, we can subtract the numerators.

28 − 12 = 16

So the answer is:

16
84

Step 3

Last of all, we need to simplify the fraction, if possible. Can it be reduced to a simpler fraction?

To find out, we try dividing it by 2...

Are both the numerator and the denominator evenly divisible by 2? Yes! So we reduce it:

16
84
÷ 2 =
8
42

Let's try dividing by 2 again...

Are both the numerator and the denominator evenly divisible by 2? Yes! So we reduce it:

8
42
÷ 2 =
4
21

Let's try dividing by 2 again...

Nope! So now we try the next greatest prime number, 3...

Nope! So now we try the next greatest prime number, 5...

No good. 5 is larger than 4. So we're done reducing.

There you have it! The final answer is:
4
12
1
7
=
4
21