How do you evaluate 4×212+534?

1 Answer
Sep 24, 2017

63/4 or 15.75

Explanation:

You can choose to do this in fractional or decimal form. I'll go through both.

Decimal
212=2.5and534=5.75

So equation becomes 4×2.5+5.75=10+5.75=15.75

Fractions
First rearrange everything so it's all improper fractions.

41×52+234

Rule for multiplying fractions: top times top, bottom times bottom.

41×52=202=10

Now we have 101+234

Rule for adding fractions: **add the top line IF the denominators (bottom line) are equal. **

It's easier to make 101 have a denominator of 4, because 23 is a prime number so we can't divide it by anything except itself.

101+234=404+234

Now add the top lines:

404+234=634