math help

What is 64/4 + 2/8?

What is 64/4 + 2/8?

Let's add

64
4
+
2
8

Step 1

Now we need to make our denominators match.

Since 4 is evenly divided by 8, we can multiply just one term to get a common denominator.

Multiply 64 by 2, and get 128, then we multiply 4 by 2 and get 8.

64/4 times 2

The problem now has new fractions to add:

128
8
+
2
8

Step 2

Since our denominators match, we can add the numerators.

128 + 2 = 130

The sum we get is

130
8

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:

130
8
÷ 2 =
65
4

Let's try dividing by that 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! Here's the final answer to 64/4 + 2/8

64
4
+
2
8
=
65
4
© 2014 Randy Tayler