Math question help?

Question

Divide
A Sunday school teacher purchases 18 yards of ribbon. She cut the ribbon into several pieces, each ¾ yard long. How many pieces did she get?
_____ Pieces

Divide (enter as an improper fraction)
Mr. James has a board that is 11 ½ feet long. He wants to give an equal piece to each of 7 boys. How long will each piece be?
____ Feet


Add (enter as an improper fraction)
Joe practiced his trumpet ¾ hour on Monday and 7/12 hour on Tuesday. How long did he practice altogether?
_____Hours

Answers I got
1. I got 61.2
2. 1.64
3. 5

Can anyone help?

For the third one it is telling me to add as an Improper fraction. And I have tried to do the ones you all said but none seem to be working..guess I need to see how to get an improper fraction from what you all told me.

Opps...nvm I got it was 4/3

Answer 1

For number one your answer is wrong. You have 18 yards of ribbon that gets cut into 3/4 yard. Sounds like division to me. Right so we have 18/(3/4). Now, when you divide you invert the fraction and multiply so we have 18 * (4/3) which equals 72/3= 24. So the answer should be 24.

Number two is right but I get the feeling your teacher might want it in fraction form since you seem to be dealing with fractions so. 11 and a half feet is the same as 23/2. You need to divide that by 7 so (23/2)/7. So now we invert and multiply like before (23/2)*(1/7)=23/14 or 1 and 9/14.

Number three: This is addition because we just want a total of two different parts. So we just need to find a common denominator and add. So 3/4 + 7/12. Lucky for us 4 is a factor of 12. So we will change 3/4 to 9/12. I just multiplied the top and bottom of the fraction by 3. That is the same as multiplying it by one because 3/3=1. That is why it is a legal operation. So now we have 9/12+7/12. So we add across the top and get 16/12. Now we need to simplify. Both of those numbers are divisible by four so you get 4/3 or 1 and 1/3 hour. Hope that helps.

Answer 2

The teacher gets 24 pieces of ribbon
you divide 18 by .75 which is 3/4

Each boy will get 1 9/14 feet
first i figured all boys will get 1 foot leaving 9/2 left the get a half a foot leaving 1 foot which we split in sevenths. add them together to get the answer

1 1/3 hour
you add 3/4 and 7/12 together and get 16/12 which reduces to the answer

Answer 3

For the first two, draw it out: 0 __________________ 18 - and put marks in for 1-17 and then put three tiny lines inside those to make fourths. and then count. that is a visual way to do it. 61 is wrong. -

and for the 3rd question- you have to take 3/4 and make it even to 7/12 - so you would take 3/4 and multiply the 3 AND the 4 by three- you then get 9/12 - then add 9/12 plus 7/12 and then you have your answer in twelths. so you have to make it into hours. 16/12 = 1 4/12 which is 1 1/3 hours.

Answer 4

# 1 18 divided by 3/4 (.75) = 24
# 2 11.5 divided by 7 = 1.64 feet long to each
# 3 3/4 9/12) + 7/12 = 1.33 hours

Acts 16:31 "Believe on the Lord Jesus Christ, and thou shalt be saved."

Answer 5

answer 1. 24
Answer 2. 1 and 9/14
Answer 3. 1hour and 20 min

Answer 6

1 and 3 are wrong. 2 is right.