Looking at the box on the left hand side, the total number of rectangles inside is 10. The number of shaded rectangles is 4. The fraction is
number of shaded rectangles/number of total rectangles
Thus, the fraction is
4/10
Considering the box on the right hand side, the total number of boxes is 100. To get an equivalent fraction, the number of boxes that should be shaded is
40/100
If we divide the numerator and denominator by 10, we would get
4/10
We can see that they are equivalent
Thus, the correct option is
Sharon should shade 40 hundredths in the model on the right and
The model represents the equation
4/10 = 40/100