Nine children want to play a
game. They need to be in teams of
two. Find out how many teams of two
there will be and whether any student would be left out.
Let’s draw a picture to represent
this scenario. Okay, so here are our nine
players. And they need to be put in teams of
two. There’s team one, team two, team
three, and team four. But this player doesn’t have
another person to play with him. He is left out. In this case, we have four teams
and one left out. That’s how you would solve this
problem, by drawing a picture.
But what if there were 87
children? You wouldn’t wanna draw a picture
of 87 children. So maybe we need another strategy
to solve this problem. Putting the students in groups of
two is the same thing as dividing nine by two.
To divide nine by two, I need to
think of numbers that are multiplied by two that are close to nine. Two times some number is about
nine. We’re close to nine. Two times four is eight. And that’s pretty close to
nine. Two times four equals eight plus
one equals nine. There will be four teams and one
remaining, one left out.