math help

What is 16/48 + 3/7?

What is 16/48 + 3/7?

Here's how we add

16
48
+
3
7

Step 1

Of course, you can't add two fractions if the denominators (bottom numbers) don't match. To get a common denominator, multiply the denominators together. Then we fix the numerators by multiplying each one by their other term's denominator.

Now you multiply 16 by 7, and get 112, then we multiply 48 by 7 and get 336.

16/48 times 7

Do the same for the second term. We multiply 3 by 48, and get 144, then multiply 48 by 7 and get 336.

3/7 times 48

The problem now has new fractions to add:

112
336
+
144
336

Step 2

Since our denominators match, we can add the numerators.

112 + 144 = 256

This yields the answer

256
336

Step 3

The last step is to reduce the fraction if we can.

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:

256
336
÷ 2 =
128
168

So far so good... let's try to divide by that number again.

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

128
168
÷ 2 =
64
84

So far so good... let's try to divide by that number again.

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

64
84
÷ 2 =
32
42

So far so good... let's try to divide by that number again.

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

32
42
÷ 2 =
16
21

So far so good... let's try to divide by that number again.

No good. So next you try the next prime number, which is 3...

No good. So next you try the next prime number, which is 5...

No good. So next you try the next prime number, which is 7...

No good. So next you try the next prime number, which is 11...

No good. So next you try the next prime number, which is 13...

No good. So next you try the next prime number, which is 17...

No good. 17 is larger than 16. So we're done reducing.

And we're done! Here's the final answer to 16/48 + 3/7

16
48
+
3
7
=
16
21
© 2014 Randy Tayler