Add -4/5 + (- 3/4). help me I do know what to do.
Get a common denominator, which for 5 and 4 would be 20. Then change -4/5 to -?/20. That will be -16 (I did that saying 20/5=4 and 4 x -4 = -16). Change -3/4 to -?/20 and that is -15/20.
Now we have -16/20 -15/20 and we add the numerators to get -31 and that is over 20 so the answer is -31/20. I don't know if you can leave the fraction as -31/20 or if you teacher wants you to change that to -1&11/20.
Subtract –1.2 - (–5.6) evaluate
To add -4/5 and -3/4, you first need to find a common denominator. The common denominator is the least common multiple (LCM) of the two denominators (5 and 4). In this case, the LCM is 20.
Next, you'll need to convert the fractions so that they have the same denominator. To do this, multiply the numerator and denominator of each fraction by the same value that will make the denominator equal to the LCM (20 in this case).
For the first fraction, -4/5, multiply the numerator and denominator by 4:
(-4/5) x (4/4) = -16/20.
For the second fraction, -3/4, multiply the numerator and denominator by 5:
(-3/4) x (5/5) = -15/20.
Now, you have both fractions with the same denominator of 20. You can simply add the numerators together:
-16/20 + (-15/20) = -31/20.
So, the sum of -4/5 and -3/4 is -31/20.