Marbles
Justin has 3 red marbles, 6 blue marbles, and 6 green marbles. If Justin wants to separate the marbles into two equal piles, how many marbles will be in each pile? (To make the piles even, assume Justin can break a marble in half if need be.)
How did your students solve this problem?
posted by Mrs. Kimball @ 4:43 PM
5 Comments:
My students just added all the marbles together and divided by two. 3 + 6 + 6 = 15/2 = 7 1/2 marbles.
The students in my class created a drawing of marbles, where they made each of the groups of six a group and then split the group of three marbles between the two groups.
The students added all of the marbles together 3+6+6=15. Since they were asked to make 2 piles they divided 15 by 2 and got the answer 7.5 marbles.
The students added the marbles together and divided by 2. Some students had difficulty so we drew pictures.
Most of my students added to find the total number of marbles and then divided by two. Some saw the blue and green marbles as already in two equal groups and then split the red marbles in half and added to the two equal piles.
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