SOLUTION: add and subtract the following fractions. 2/3+5/7 3/4+7/12 4/9-1/8

Question 200061: add and subtract the following fractions.
2/3+5/7
3/4+7/12
4/9-1/8
Answer by jerrybassmasta(14) (Show Source): You can put this solution on YOUR website!
Adding and subtracting fractions are very simple, that is if yo know only one rule.
The rule is to have common denominators.
2/3+5/7
The common denominator for 3 and 7 will be 21. The easiest way is to just multiply them together.
So you have 21, then you ask yourself. How many times did 3 go into 21. (7 times) So you multiply 2 by 7 as well. Same for the other side. How many times does, 7 go into 21. (3 times) So you multiply 5 by 3.
Now you have.
14/21+15/21 Now you can add them as normal numbers. (Remember you don't add the denominators)
29/21
Reducing them are quite simple as well, all you do as subtract the top number from the bottom number.
1 and 8/21

3/4+7/12
Using the same steps you should start off with.
9/12+7/12
16/12
1 and 4/12 You can also simply simplify it to.....
1 and 1/3

4/9-1/8
32/72-9/72
21/72
7/24
RELATED QUESTIONS
what is the inverse operation of 1. divide by 8? 2. divide by -5? 3 multiply by 10?... (answered by richard1234)

could someone please help me with these fractions.They are add or subtract the following... (answered by checkley75)

Add the following fractions, showing the steps you used: (a) 2/3 + 3/4 = (b) (3/5... (answered by carl)

I'm in 6th grade and need help with adding fractions please. Thank you. 7 3/4+ 2 2/3= (answered by wilft1,solver91311)

For each of digits below, add opertion symbols and parenthese so that the answer is 24. (answered by Edwin McCravy)

Which of the following fractions is closest in value to the decimal 0.40 ? 1/3... (answered by josgarithmetic)

Can you please help me with these questions? I am stuck! 1. Simplify completely. 5x - (answered by edjones)

Which of the following fractions have terminating decimals and which have repeating... (answered by checkley71)

Which of the following groups contains three fractions that are equal? 1/2, 1/4, 1/8 (answered by Alan3354)