Grades 3-4 Video Solutions 2022-2022_3-4

Video Transcription

Problem number three. Rosetta wants to put two coins in each row and in each column of the grid.  Which coin does she need to move to an empty cell? A, B, C, D, or E.  We're going to look at each column and row, and in one row and one column we'll have too many coins.  We'll start by looking at the columns. If we look at the first column, we see that it has three coins. All the others, except for the second one, have two coins.  The second one only has one coin. So the coin that we need to move is in the first column.  And now, if we look at the first row, we see it has two coins, and same at the second and third.  But we see in the fourth row that it only has one coin. And then we see that the fifth row has three coins. And then we see that the fifth row has three coins.  And the coin that is in the column and the row is C, which means we have to move C.

Video Summary

To solve the issue of having two coins in each row and column of the grid, identify where there are too many or too few coins. The first column has three coins, while others have two, except the second column which has one. The first, second, and third rows have two coins each, the fourth row has one, and the fifth row has three. The coin located at the intersection of an excess column and row is coin 'C'. Thus, moving coin 'C' will balance the grid.

Keywords

grid

coins

balance

columns

rows