Transcript
Let’s do another!
Look closely at this one! Try it on your own and then turn to your neighbor and see what they got!
1/2+ 1/7=?
Let’s go through all the factors for the Denominators
2: 2,4,6,8,10,12,14,16,18,20….7: 7,14,21,28,35,42,49…
Do they have any numbers in common? Which is the least? (LCM)
14!
So if we make the new denominator 14, we have to change the numerators too. Let’s do this together
Old: 1/2+1/7New: 7/14+ 2/14
Now we can solve this easily! What is the answer?
Finding the LCM is key in solving fraction problems with unlike denominators!
You use this method for subtracting fractions too!
Let’s try more!