What should be substracted from `-3/4` to get `-5/6` ?

Answer

To solve the problem of what should be subtracted from \(-\frac{3}{4}\) to get \(-\frac{5}{6}\), we can follow these steps:

### Step 1: Set up the equation
Let \(x\) be the number that we need to subtract from \(-\frac{3}{4}\). The equation can be set up as:
\[ -\frac{3}{4} - x = -\frac{5}{6} \]

### Step 2: Rearrange the equation
To isolate \(x\), we can rearrange the equation:
\[ -x = -\frac{5}{6} + \frac{3}{4} \]

### Step 3: Simplify the right side
Now we need to find a common denominator to add the fractions \(-\frac{5}{6}\) and \(\frac{3}{4}\). The least common multiple of 6 and 4 is 12. We convert both fractions:
\[ -\frac{5}{6} = -\frac{10}{12} \quad \text{(multiplying numerator and denominator by 2)} \]
\[ \frac{3}{4} = \frac{9}{12} \quad \text{(multiplying numerator and denominator by 3)} \]

Now substituting these values back into the equation:
\[ -x = -\frac{10}{12} + \frac{9}{12} \]

### Step 4: Combine the fractions
Now we can combine the fractions:
\[ -x = \frac{-10 + 9}{12} = \frac{-1}{12} \]

### Step 5: Solve for \(x\)
To find \(x\), we multiply both sides by -1:
\[ x = \frac{1}{12} \]

### Final Answer
Thus, the number that should be subtracted from \(-\frac{3}{4}\) to get \(-\frac{5}{6}\) is:
\[ \boxed{\frac{1}{12}} \]