math
posted by Tonya .
I need help bad.
Fractions
1)1/3 + 5/12 + 4/5 =
2)13/15  11/20 =
3)1 1/15 + 3 3/10  2 4/5 =
4)Robin ran 5 1/3 mi on Sunday, 2 1/4mi on Tues, and 3 1/2mi on Fri. How far did she run during the week?
5)The interest rate on an auto loan in May was 12 3/8%. By September the rate was up to 14 1/4%. How many percentage points did the interest rate increase over the period?
6)Julio works as a quality control expert in a beverage factory. The assembly line that he monitors produces about 20,000 bottles in a 24hour period. julio samples about 120 bottles an hour and rejects the line if he finds more than 1/50 of the sample to be defective. About how many defective bottles should Julio allow before rejecting the entire line?
7)Lunch meat sells for about $3 per pound. You use about 1/2 pound per day for sandwiches. How much should you budget for lunch meat over the next month (about 20 workdays)?
8)17 11/12 / 6 1/10 =

For the first three problems, you need to change these fractions so they have a common denominator. Then add or subtract the numerators.
Example:
1/3 + 5/12 + 4/5 =
The number that's divisible by 3, 12, and 5 is 60.
1/3 = 20/60
5/12 = 25/60
4/5 = 48/60
20/60 + 25/60 + 48/60 = ?
Please attempt the other problems and post your answers. We'll be happy to check them for you. 
These are exercises in converting to a common denominator, and then adding or subtracting fractions. Here is how to do the first one.
1) The common denominator is 3x4x5 = 60
1/3 + 5/12 + 4/5 = (20+25+48)/60 = 93/60
= 1 33/60 = 1 11/20 = 1.55
Now you try the others. There are many math teachers here willing to help student who make an effort. Someone will be glad to critique your work. 
9 1/5  7 6/25 = 46/5  181/25 =
230  181/25 = 49/25 = 1 24/25
Now estimate to see if the answer is reasonable by rounding each mixed number to the nearest integer then subtracting.
Respond to this Question
Similar Questions

Math repost for Robin
math  Robin, Tuesday, October 2, 2007 at 5:50pm my text book is confusing and complicated and I don't have anyone I can ask for help right now. all I want is to know how to multiply fractions like 1x2 1 4 3 
math
Ms Writeacher my math work book which is a fifth grader Harcourt Math Practice Workbook does not say what Tues so my mon think it has to be the same Tues in the week of the other days 
math
on friday catlin ran 1 and 1/5 miles on sunday she ran 1 and2/5 miles.On the same two days her friend lee ran a total of 3 miles.How much father than catlin did lee ran? 
Math
I need help with this equation, I am really bad at fractions. m^2  (49/2 * m)= 1/2 
Math
I need help with this equation, I am really bad at fractions. m^2  (49/2 * m)= 1/2 
Math
On Saturday, Cecelia ran 3 3/7 miles. On Sunday, she ran 4 5/6 miles. How much farther did Cecelia run on Sunday than on Saturday? 
Math
On Monday, Casey ran 5 miles. On Tues, she ran three and three fifths miles. How much further did she run on Mon than Tues? 
Mathematics.
6 and 2/7 divided by 2 and 3/4. I'm very bad at dividing fractions. I just got into this subject of dividing fractions and I'm really bad at it. If you could explain how to divide this expression, that'd be great. Thanks :). 
Math
Karen ran 42 miles in 6 days. On Sunday she ran 12 miles. Each of the other days she ran the same distance. 1. Write an algebraic equation to show how far Karen ran. 2. Calculate how many miles Karen ran each day for the week. 3. Explain … 
math
If there are 150 students in the club and a recent survey shows that 3 out of 5 prefer Tues. meetings, how many do not want to meet on Tues. ?