Write expressions from words
Being able to move between words and symbols is a big step toward algebra for your child. In 6th grade they will write expressions with letters, like 4 × (n + 2) for four friends each paying for a ticket and a snack. A child who already sees that 3 × (250 + 75) is three times something can check answers by sense, not only by arithmetic.
In this video, your child will learn to turn words into math expressions.
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
Which means "add 8 and 7, then multiply by 2"?
Example 2
3 × (18 + 9) is how many times as large as 18 + 9?
Your child's turn
Which means "add 5 and 7, then multiply by 3, then subtract 2"?
The three key steps
- 1Write each step as math.
- 2Do it first? Use parentheses.
- 33 × (a sum) is 3 times as big.
Mistakes to listen for
- Writing the numbers in the order they appear, so "multiply by 3 the sum of 5 and 7" becomes 3 × 5 + 7.
- Calculating before describing, so they work out 5 × (14 + 9) = 115 instead of saying it is five times 14 + 9.
- Leaving out the parentheses, so "add 4 and 6, then double it" becomes 4 + 6 × 2 = 16 instead of 20.
The lesson shows every step, so your child sees why it works. Read our parent's guide to turning words into number sentences →
Is your child ready to practice what they've learned?
Bobby's Math Club offers unlimited practice for free.
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More 5th grade Problem Solving, with questions your child answers along the way.
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 turning words into number sentences, 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 turning words into number sentences 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 turning words into number sentences
Questions at your child's level, about five minutes a day, on turning words into number sentences and whatever PK-5 skills they need to develop. Unlimited practice, free forever.
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