Understand place value with decimals
Once this idea clicks, decimals start to make sense for your child. Seeing that each place is worth ten times the one to its right turns multiplying by 10, rounding money, and lining up decimals into one idea instead of separate tricks. Without it, decimals can feel like rules to memorize, which makes percentages and measurement in middle school harder than they need to be.
In this video, your child will learn to see how a digit's value changes by tens.
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
7 ÷ 10 = ?
Example 2
0.7 = ? × 0.07
Your child's turn
0.6 ÷ 10 = ?
The three key steps
- 11 place left: 10 times as much
- 21 place right: 1/10 as much
- 3The point stays; digits move.
Mistakes to listen for
- Believing the pattern works only for whole numbers, so they know 70 is ten times 7 but not how 0.7 and 0.07 relate.
- Mixing up the direction, so they say the 4 in 0.04 is worth more than the 4 in 0.4.
- Treating the decimal point as a wall, reading 3.33 as "three and thirty-three" instead of 3 ones, 3 tenths, and 3 hundredths.
The lesson shows every step, so your child sees why it works. Read our parent's guide to what each digit is worth, including decimals →
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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 what each digit is worth, including decimals, 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 what each digit is worth, including decimals 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 what each digit is worth, including decimals
Questions at your child's level, about five minutes a day, on what each digit is worth, including decimals and whatever PK-5 skills they need to develop. Unlimited practice, free forever.
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