Main content

## Class 8 (Foundation)

# Adding & subtracting decimals word problem

CCSS.Math:

Let's get fancy and practice adding and subtracting decimals in the same word problem. Created by Sal Khan and Monterey Institute for Technology and Education.

## Want to join the conversation?

- thank you for this great video it really helped! is there more videos on other math problems?(1 vote)
- way to easy, can you make it more chalinging(1 vote)
- how are you doing with the math poblem?(1 vote)
- This is not the type of decimals that I'm doing I can't find a video on this type of

subtracting decimals!(1 vote) - There is no difference on this it's just like your adding but with a decimal(1 vote)
- what is the hardest problems you have solved(1 vote)

- hey guys quandale dingle here my goofy ahh uncle is holding me captive AAAH My friend barnacle jones junior was hit with a rhinoceros horn because he was listening to no maidens(1 vote)
- Okay. So I tried this problem the same way, but I got a whole different answer. So, did I do something wrong?(1 vote)
- how do i solve proportion problems(1 vote)
- There are two ways to solve proportion problems, you can cross multiply the problems or multiply the top and the bottom(1 vote)

- So he has $5097.58 left after he depsoits and withdraws.(1 vote)
- yes he does in the end.(1 vote)

## Video transcript

Leo has $4,522.08 in
his bank account. He deposits another
$875.50 and then withdraws $300 in cash. How much is left
in his account? So he's starting
with $4,522.08. Let's write that down. $4,522.08. And then he deposits, or he
adds, another $875.50. So he's going to add $875.50. When you deposit into an
account, you're putting something into the account, or
you're adding to the account. So after he adds that $875.50,
what does he have? We go back to the penny spot,
or we could view that as the hundredths. A penny is one hundredth
of a dollar. Let me switch colors. We have 8 plus 0 is 8. 0 plus 5 is 5. We have the decimal
right there. 2 plus 5 is 7. 2 plus 7 is 9. 5 plus 8 is 13. Put the 3 down here and regroup
the 1, or carry the 1. 1 plus 4 is 5. So after the $875.50 deposit,
he has $5,397.58. Then he withdraws $300 in cash,
or he takes out $300, so we'll have to subtract that. So then he withdraws $300 and
I just added some trailing zeroes after the decimal. $300 is the same thing as
$300.00 and zero cents. And then we subtract. 8 minus 0 is 8. 5 minus 0 is 5. We have our decimal
right there. 7 minus 0 is 7. 9 minus 0 is 9. 3 minus 3 is 0, and then 5
minus nothing here is 5. So he's the left with, in
his account, $5,097.58.