# Tic Tac Toe Subtraction Game

## Elementary / Math

High first graders. Today I'm going to teach you how to play a game. That is called tick tack toe. Subtraction game. There are three different boards. And you're going to play with two people only two, okay? The interesting part about this is that you only need one game board for two people. So when you're playing with two people, you will need one. You don't need to. Just one. All right, I picked the yellow one. And let me show you how to play. This is what it looks like. There's also another one, purple one that looks a little different. But it's the same idea. And I'll explain it to you, okay? All right, here we go. This is what I need to play. I need two different colors. Of counters. So one player is going to be one color. And another player is going to be another color. So for this one, we're going to pretend one player is yellow. And one player is going to be green. You can also do other colors. If you want to do purple and red, you can do that too. I'm going to do purple and green. All right, so one player has one color. Another player has another color, but we're using just one board. We're going to do rock-paper-scissors to see who goes first. I'm playing by myself. So I don't have to do rock-paper-scissors. But when you're with your partner, it's only fair to do rock-paper-scissors. The first player is going to pick one of these boxes. It is your choice, whichever one you'd like. I'm going to pick this one right here. The one that says 7 -5. So I have to figure out what is 7 -5. I grabbed a white board for myself. It might be a good idea for you to grab a whiteboard too. So the problem is 7 minus 5. Now, this is subtraction. So I'm going to circle the bigger number, and I'm going to draw that one, two, three, four, 5, 6, 7. Now, I am not putting together. That's addition. This is subtraction. So I'm taking away. So I have 7 and I have to take away 5. So I'm going to take away 5. We use my research to take away 5. Take away one, two, three, four, 5. I have one, two, left. So 7 -5 is equal to two. I just figured that out. My partner also has to check my work to make sure that I am correct. If I am correct, then I can take my chip. I can take my check, and I can cover the box that had the equation. 7 -5, I can cover that up. Now, it is my partner's turn. So I'm going to pretend that I am the other partner. So the other partner has the green tips. So the other partner is going to pick one of the equations on here. I'm going to have to pick this one. 13 minus four. So let me grab my whiteboard again. That's erase that other equation I was working on. 13 minus four. I'm going to circle the bigger number. And I'm going to draw that. One, two, three, four, 5, 6, 7, 8, 9, ten, 11, 12, 13. And now minus, so that means take away. I'm going to take away four, so I'm going to erase four. One, two, three, four. Let me count how many I have left. One, two, three, four, 5, 6, 7, 8, 9. I have 9 left. So 13 minus four is equal to 9. My partner should always be checking my work. To make sure that I'm doing it right. If I get it correctly, then I can take my chip, and I can put in the equation that I got right. You're going to keep taking turns with your partner. And you're trying to get four in a row. So you can win like this. Like this. You can win like this. Or you can also win diagonally like this. But let's say I have these two. And I got this one too. I can't win this way because my partner's chip is here. So your partner might try to block you from winning. And that's okay. That's part of the game. If you keep going and no one wins, then it's a tie. And you can play again. This is a great way for you to practice your subtraction. So again, you need two different color chips. And it's also a good idea to grab a whiteboard for this activity so that you can practice and check your work. Let me know if you have any questions, and I hope you have fun. Bye.