How can you tell if 78 is divisible by 2,3or6

Well, first thing is 78 is an even number so 2 would automatically go into 78. For 3 & 6, you could skip count up to 78, or use a calculator if you really wanted to. Another thing you could do is look at what 3 & 6 go into. 12 x 6 = 72, and 72 + 6 = 78. For 3, 12 x 3 = 36, 36 x 2 = 72, 72 + 3 + 3 = 78. I hope this was helpful!

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.