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### Course: Arithmetic>Unit 13

Lesson 4: Adding and subtracting fractions with unlike denominators

# Adding and subtracting 3 fractions

Learn how to add and subtract fractions with unlike denominators. They watch the process of finding a common denominator, then practice adding and subtracting the fractions to solve the problems.

## Want to join the conversation?

• What do I do if I have three minuses?
• Same thing as normal, unless if the answer goes into negatives which isn't likely.
• Why are the questions hard
• Bc they want us to learn sum or to break our brains. Either one
• if order of opperations is exponenents, x divition, addition, subtraction. wouldn't the secound awsner be -1/18
• hi I need help do you how to do this
• Find the LCM then change that to the LCD and then subtract, add, multiply, divide. ( LCM means least common multiple) (LCD means least common denominator)
• I need help on this topic please.
• What do you need help with?
• what is

\[\dfrac{3}{5} + \dfrac{7}{10} - \dfrac{1}{2} = \]
• What is that question bro!
i think i must me going insane...
(1 vote)
• It doesn't make sense when the top number is more than the demoninator on the worksheet
• It’s Just a mixed numeral
• will it always matter on the denominator