Closest to 100

OK, turn your cards over. Share them with your partner. Turn them over. Have a look.

Now who can remember, what is the target number?

100.

So 2 and 8 are 10. They are 10. And then these two [cards] are 10. So these [cards] are 20 and we have this which is a 5.

So we have 25.

Is that as high as you can get... to 100? Is there something else we could try?

We could make maybe 85.

Keep going Colin.

Oh yeah, 85. I'm thinking like we could go... Yeah 85...and with the 15. We need to use all of the cards.

We don't have to, I don't think.

Okay. So you don't have to use all the cards.

Oh, ok! So we are done. 85 plus 15. That's 15. That would make 100. We did it!

We did it!

I'm back here with one of my favorite mathematicians again. Hi Sam.

Hi Michelle.

Now Sam, you were telling me that you have a different way of playing "How close to 100" so you came up with this idea using Uno cards. Do you want to explain what your idea was with the wild card?

So we would say, you would go through them, you would keep all... you could, so you could keep all these.

Then you would deal it out you get six each.

Then, we would then if you got any like wild cards.

Oh yeah, I got one.

Then you could, you can only use two at a time.

OK.

Like in one game. So, so like if you want too, and like instead of having to put them all in how many players there are you, for each player, you would put in two wild cards.

And what is a wild card let me do?

It let's you put down any number you want, but it can't be 100 or it has to be a two digit number.

Alright, let's play. How many ways do you think you can?

I think I can make 100 using my cards because the numbers can represent ones or tens. And I can definitely find one way and I think I might have two ways. Eighty. So you're saying 8 is 8 tens. Yes, 80, 10 and 10. Oh yes because 8 tens and 1 ten and another 10 is 10 tens which we call 100.

OK, well, I could do 8 tens and 2 tens which we call 100 but I think I could also do something like, um, I'm wondering. You could do 92 and 8.

Oh yeah, so I could say that's a 9 tens and two more so 92 + 8. And that's a really nice idea. I was also thinking about Sam, I could do something like, oh yeah, 9 tens + 6 tens - 5 tens. Yeah, Oh yeah. Yeah, because 90 + 60 would be 150 - 50 would get me to 100 again. What about your cards have you got another way?

I think I could do 80 + 50 - 30 and then, yeah. You could also just do this one 5 tens + 5 tens is eight tens. Oh yeah or I could do. Oh, 10 tens. 50 * 2 it goes one and one - two. Oh yeah, and then that would be 100. Oh yeah, so you can use multiplication if you want to extend in your game too yeah.

So why is this your favorite game Sam?

I just like to add to 100 and I really likeaddition and like all maths and stuff.

Yeah, does it make your brain think?

Yeah, I guess.

That's cool. Thanks for showing me your your version of the game. Thank you.

Welcome.