Multiply fractions
Multiplying fractions puts real tools in your child's hands: finding half of a recipe, three quarters of a price, or the area of a 1/2 foot by 3/4 foot tile. Understanding "a fraction of" an amount is also what makes dividing fractions in 6th grade, and percentages and probability after that, make sense. Without it, those topics can turn into rules applied without knowing why.
In this video, your child will learn to multiply fractions and whole numbers.
The lesson stops at each question for your child's answer.
Three problems, each a little harder
Each problem is worked step by step. Your child will solve the last one before Bobby shows how.
Example 1
1/2 × 3/4 = ?
Example 2
3/4 × 8 = ?
Your child's turn
3/4 × 2/3 = ?
The three key steps
- 1Times a fraction: a part of it
- 2Multiply the tops
- 3Multiply the bottoms
Mistakes to listen for
- Multiplying the whole number by the top and bottom, so 3 × 2/5 becomes 6/15, the same size as 2/5, instead of 6/5.
- Reading "1/2 of 3/4" as addition and answering 5/4, instead of a number smaller than 3/4, which is 3/8.
- Finding a common denominator before multiplying, as for adding, which makes the work longer and invites errors.
The lesson shows every step, so your child sees why it works. Read our parent's guide to multiplying fractions, like 2/3 × 4/5 →
Is your child ready to practice what they've learned?
Bobby's Math Club offers unlimited practice for free.
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Questions parents ask
Does my child need an account to watch?
No. You can watch this on any device at any time. If your child would like to practice multiplying fractions, like 2/3 × 4/5, and you'd like parent-friendly reports on your child's progress and growth, you can join Bobby's Math Club for unlimited free practice.
What happens when my child answers a question?
A right answer gets a cheer, and the lesson carries on. If your child isn't sure, they can tap "I don't know yet", and Bobby gives the answer and shows another example. Nothing is scored or stored.
Is this the same lesson that's on YouTube?
Yes. Here, the lesson stops at each question and waits for your child to answer. On YouTube, each question stays on screen for a few seconds, and then the lesson plays on.
Where can I learn more?
There's a short, kid-friendly lesson like this one for every Pre-K to 5th grade math skill, all in our video library. Our parent's guide to multiplying fractions, like 2/3 × 4/5 has more on where kids get stuck and how you can help at home. In the club, your child practices at just the right level, about five minutes a day, and you get parent-friendly reports as they grow. Learn more about how it works →
Practice multiplying fractions, like 2/3 × 4/5
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