Another math question

[Magic Mom]

6 8/9 - 2/5 - 2 7/8

I know what the answer is supposed to be, but I'm not getting that answer. The website that the teacher printed from might be wrong, but I need to make sure because I want to make sure I am helping DD correctly.

 

[BCDisneyFanatic]

6 8/9 - 2/5 - 2 7/8

I know what the answer is supposed to be, but I'm not getting that answer. The website that the teacher printed from might be wrong, but I need to make sure because I want to make sure I am helping DD correctly.

6 8/9 - 2/5 - 2 7/8

= 62/9 - 2/5 - 23/8

Find a common denominator: 360

62/9 = 2480/360

2/5 = 144/360

23/8 = 1035/360

(2480-144-1035)/360 = 1301/360 = 3 221/360

 

[hopemax]

Step 1: Convert to an improper fraction

62/9 - 2/5 - 23/8

Step 2: Find least common denominator. In this case it's 360

(62 * 40)/360 - (2*72)/360 - (23*45)/360

Step 3: Multiply it out and subtract

2480/360 - 144/360 - 1035/360 = 1301/360

Step 4: Convert to mixed fraction

3 221/360

Step 5: Look to see if you could reduce the fraction part of it. In this case you can't.

So the answer should be 3 221/360

But that seems like a weird answer to have, so there probably is an error somewhere.

 

[Magic Mom]

6 8/9 - 2/5 - 2 7/8

= 62/9 - 2/5 - 23/8

Find a common denominator: 360

62/9 = 2480/360

2/5 = 144/360

23/8 = 1035/360

(2480-144-1035)/360 = 1301/360 = 3 221/360

Thank you! My mistake was trying to seperate the mixed fractions. Then I came up with a negative fraction and couldn't figure out how to go from there.

 

[Magic Mom]

Step 1: Convert to an improper fraction

62/9 - 2/5 - 23/8

Step 2: Find least common denominator. In this case it's 360

(62 * 40)/360 - (2*72)/360 - (23*45)/360

Step 3: Multiply it out and subtract

2480/360 - 144/360 - 1035/360 = 1301/360

Step 4: Convert to mixed fraction

3 221/360

Step 5: Look to see if you could reduce the fraction part of it. In this case you can't.

So the answer should be 3 221/360

But that seems like a weird answer to have, so there probably is an error somewhere.

No, you're correct. That's the answer on the key.