Mrs. smith needed to split 28 students into 4 equal groups for the race. which step could her to work 30 divided by 3?
(a) (27 divided by 9) + (9 divided by 3)
(b) (24 divided by 4) + (4 divided by 4)
(c) (21 divided by 3) + (9 divided by 3)
(d) (20 divided by 4) + (10 divided by 4)

Procedure in option C only works.

Step-by-step explanation:

We have to select the process in which Mrs. Smith can help her to work 30 divided by 3.

(A) (27 divided by 9) + (9 divided by 3) = 3 + 3 = 6  

But (30 ÷ 3) = 10 ≠ 6

(B) (24 divided by 4) + (4 divided by 4) = 6 + 1 = 7 ≠ 10

(C) (21 divided by 3) + (9 divided by 3) = 7 + 3 = 10

(D) (20 divided by 4) + (10 divided by 4) = 5 + 2.5 = 7.5 ≠ 10

So, procedure in option C only works. (Answer)

Again, we can prove the procedure in the following way:

{Which is the distributive property of division}