De una caja de 24 dulces, Juanita se comió 1/4
de estos, ¿cuántos dulces le sobraron?

23.75

Step-by-step explanation:

24 - 1/4 = 23.75

You need to multiply when converting from a larger unit to a smaller unit basically because multiplication is repeated addition, and addition always makes a unit larger. One example is that lets say you have the number 2. If you multiply 2 by 5, you get 10. 10 is greater than 2, therefore, the unit became larger as it was multiplied.