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##### math... add integers with the same sign

label Algebra
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schedule 1 Day
account_balance_wallet \$5

sofia owes her brother \$25. she gives her brother the \$18 she earned dog-sitting. write an addition expression to describe this situation. then

Oct 20th, 2017

I assume that after writing an expression it needs to be solved? Let's begin by breaking the question into parts...

sofia owes her brother \$25..this represents a total so keep that in mind...

she gives her brother the \$18 she earned dog-sitting...

So from Sofia's perspective the \$25 is a bill. She paid the brother \$18 thus "deducting" \$18 from the \$25 bill. See where this is going? So your expression would be 25-18. This is a subtraction expression however.

We do know that she paid \$18 off the bill for \$25 so we could subtract 25 from 18 which is...7.

A valid addition expression would be x + 18. This reads "18 more than a value x". If you want to replace x then do it like this...."7 + 18". This would be your addition expression and the answer you are looking for. Do you need to calculate the sum as well? Well 7 + 18 is what? 25. Which is exactly how many total dollars Sofia owes her brother!

Aug 19th, 2014

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Oct 20th, 2017
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Oct 20th, 2017
Oct 21st, 2017
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