answersLogoWhite

0

To determine the sum of two fractions with different denominators, you must first make the denominators the same. One way to do this is to multiply the denominators by each other to get the new, equal denominator, and then cross multiple the old denominators with the numerators to get equivalent fractions.

Sound hard? Really, it's not!

Take 1/3 and 1/5. Cross multiply the top and bottom. 5*1=5 and 3*1=3. So your new numerators are 3 and 5. Now multiply the denominators. 3*5=15. Now your new fractions are 3/15 and 5/15. These are the same as 1/3 and 1/5, they are just not simplified. Now you can just add the numerators, keep the same denominator, see if you can simplify, and you're done!

3/15+5/15=8/15, which is can't be reduced any further.

User Avatar

Wiki User

12y ago

Still curious? Ask our experts.

Chat with our AI personalities

BlakeBlake
As your older brother, I've been where you are—maybe not exactly, but close enough.
Chat with Blake
ViviVivi
Your ride-or-die bestie who's seen you through every high and low.
Chat with Vivi
RafaRafa
There's no fun in playing it safe. Why not try something a little unhinged?
Chat with Rafa

Add your answer:

Earn +20 pts
Q: How do you work out one third plus one fifth?
Write your answer...
Submit
Still have questions?
magnify glass
imp