Grades 3-4 Video Solutions 2026-2026_3-4

Video Transcription

Video Summary

Number 17. Rosie wants to write the numbers 2, 0, 2, and 6 in the grid shown, so that each row and each column contains exactly 1 0, 1 6, and 2 2s. She has already filled in some of the squares. When she is finished, what will be the sum of the numbers in the squares marked with the question marks? Pause if you would like to try and solve it yourself. Okay, so for this one it's pretty simple. We can see that this question mark over here is in a row with a 0, and we know there's only one 0 in each row, so this can't be a 0. And we also know that there's exactly one 6 in each column, so this can't be a 6 either, right? So the only possibility is that it's a 2. This can't be a 0 because it's in the same row as another 0. It can't be a 6 because it's in the same column as another 6, so it has to be a 2. And now we can do the same thing for this question mark. It's in the same column as this 0, so it can't be a 0. It's in the same column as this row, excuse me, as this 6, so it can't be a 6, so it has to be a 2. And now we just know what the two numbers are. They're both 2s, so the sum of 2 plus 2 is 4. So the correct answer is option C.

Keywords

number puzzle

grid logic

row and column constraints

sum of marked squares

Rosie