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Lesson 3: One and two-step word problems

# Setting up 2-step word problems

Sal represents 2-step word problems with equations.

## Want to join the conversation?

• Why do we need parentheses?
• We use the parentheses to make it clear that we are dividing the entire result of `58-13` (number of pages remaining) by `5` to figure out the number of days to finish the book.
Without it, the equation would look like `d = 58-13/5`, which would only divide the `13` (remember Order of Operations).
Hope this helped!
• How!!I don´t know how to do this can one of you guys help me??!!I don´t get a thing!!
• carefully watch the video!
• why do we have parentheses
• Hi oashish! We use parenthesis in math for many things. When you have a number in parenthesis next to another number, it means you have to multiply. If you have an expression in parenthesis, it means that you have to do that expression first in the overall equation. All in all, parenthesis are an essential part of math. Hope this helps. Have a great day! 😁
• Why do we need parentheses?
(1 vote)
• Copying from the great answer from TheReal3A

"We use the parentheses to make it clear that we are dividing the entire result of 58-13 (number of pages remaining) by 5 to figure out the number of days to finish the book.
Without it, the equation would look like d = 58-13/5, which would only divide the 13 (remember Order of Operations).
"

Hope this helps!
(1 vote)
• Why parenthesis I mean can't you just do the problem without parenthesis?
• Hello! I'm so happy you asked! So yes you could do the problem without the parenthesis, but it keeps the two equations apart so it makes it easier. What this also does is break it up into a few steps.
• who is this. I bet it is not Sal
• It is sal
• what are parenthesis for
• Parentheses are () enclosing some part of an expression. They are grouping symbols, which associate numbers and operations together.
Also, the Order of Operations tells us to evaluate groupings first!

The video shows how you can find number of days to finish a book.
Well, you know there's `58` pages in the book, and you have already read `13` pages.
So the number of remaining pages is `58 - 13`.
However, you can read `5` pages per day (this is a rate). By dividing number of remaining pages by the rate, you get the days left.
`(58 - 13)/5`
You have to put parentheses to associate all of `(58 - 13)` with the number of remaining pages! Otherwise, it would look like `58 - 13/5`, which would only divide the `13` (incorrect).

Hope this helped!