deecarney4 said:
2/3 +3/7= 7/10
3/7 + 4/12= 10/16
4/1-1/8= 3/1
2/5x5/7=10/21
1/3x5/9= 5/27
7/5x11/6= 77/30
fractions into decimals
3/5=.15
U
43/100= .143
are theses right or am i doing something wrong
Um....you're doing LOTS of things wrong.
I'll deal with just a couple of your questions.
2/3 + 3/7
You can't add or subtract fractions unless they have the same denominator....your fractions DON'T.
The least common multiple of 3 and 7 is 21, so 21 is the least common denominator for you fractions. Multiply the numerator and denominator of the first fraction by 7, and multiply the numerator and denominator of the second fraction by 3:
2*7/3*7 + 3*3/7*3
14/21 + 9/21
Ok...now the fractions have the same denominator. Add the numerators, and put the result over the common denominator:
14/21 + 9/21 = (14 + 9) / 21 = 23/21
Use the same approach on the second and third problems.
For the fourth problem, does "x" mean "times"???
If so, multiply the numerators of the fractions, and multiply the denominators of the fractions:
(2/5)*(5/7) = (2*5) / (5*7), or 10/35....now, reduce that fraction.
Do the next couple of problems the same way.
To write 3/5 as a decimal, remember that a fraction indicates a division. 3/5 means "3 divided by 5" Do the division....
3 divided by 5 is 0.6
Use the same approach on the remaining problems.
If you are still having trouble, please repost, showing us EVERY step you took to try to answer each question....then we can see where you need help.
