I have math questions....first how do i add -4/5 + (-3/4) = Second add 1/2 + 4/9 is it 17/18?

Question

please help

Answer 1

To add -4/5 + (-3/4), first you have to find a common denomenator, which in this case is 20.

-4/5 + (-3/4) = -16/20 + (-15/20)
-16/20 + -15/20 = -31/20, which reduces to -1 and 11/20

for the second question:
1/2 +4/9, again find the common denominator. in this case it's 18
1/2 + 4/9 = 9/18 + 8/18, so yes, your answer is 17/18.

Answer 2

you first need to get a common denominator.. so 4/5 and 3/4 turn into 16/20 and 15/20
-you get 4/5 into 16/ 20 by multipling both numbers by 4
-and 15/20 comes from multiplying both numbers by 5

then simply you just take the nominators like a simple equation: -16 + -15 = -31 so its -31/20


the next one is pretty much the same thing:
2 and 9 both go into 18 so
***1/2 = 9/18 (times both by 9)
***4/9 = 8/18 (times both by 2)
**** 9+8 = 17
final answer 17/18 - right!



i hope this helped

Answer 3

-4/5 + -3/4 = -16/20 + (-15/20) = -31/20

17/18 is right because 2 and 9 have 18 in common so 1 times 9 is 9/18 and 4 times 2 is 8/18 so 8+9=17/18.

Answer 4

Your on a roll.... 1/2 + 4/9 = 17/18. See how you did it? Apply to all fractional equations.... -4/5 + -3/4 = -16/20 + -15/20 = -31/20 = negative 1 11/20.

Answer 5

-4/5 + (-3/4) = -16/20 + (-15/20) = -31/20
1/2 + 4/9 = 9/18 + 8/18 = 17/18
Here it's how it works:
You have to multiply the numbers so that they have the same second number (that cams down) and then you just add or substrate the numbers that are up. 2 negative numbers added are a positive number, like -3 + (-4) = 7.
Hope that helps !

Answer 6

Here's what you do: multiply diagonally and then across the bottom when the denominators are different. So, the first one would be:
-4*4 - 3*5
------------ = -31/20
5*4
The second is:
1*9 + 4*2
------------- = 17/18
2*9
Remember to reduce the fractions at the end if necessary.

Answer 7

Find a common denom.--so for -4/5 + -3/4 it's 20, and multiply numer. by the # it takes to get 5 and 4 to 20. So, -16/20 + -15/20= -31/20. And your second answer is right.

Answer 8

-4/5 + (-3/4) = -16/20 + (-15/20) = -31/20 = -1 (11/20)

The second one you've answered correctly.

Always remember that whenever adding numbers, fractions of the same sign (+ or -) you add them as normal. Just don't forget to add the same sign value as carried by the numbers being added.

Answer 9

-4/5 + (-3/4) = -16/20 + (-15/20) = -31/20 or -1 11/20
yes, the second one is correct.

Answer 10

-4/5 + (-3/4)
-4/5 - 3/4 = -16/20 - 15/20
= -31/20
= - 1 11/20

second one is correct