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# Adding & subtracting decimals word problem

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.