Question

a thermometer shows a temperature of -20\frac{3}{4} degrees. a chemist recorded this temperature in her notebook using a decimal. which number did the chemist write in the notebook? -21 4 -21 3 -20 75 -20 34

Explanation:

Step1: Convert the fraction part to decimal

To convert $\frac{3}{4}$ to a decimal, divide 3 by 4. So, $3\div4 = 0.75$.

Step2: Combine with the integer part

The original number is $- 20\frac{3}{4}$, which is $-20 - \frac{3}{4}$. Substituting the decimal - equivalent of the fraction, we get $-20-0.75=-20.75$.

Answer:

-20.75