Hello, I'm Debbie Yutzy. I'm a kindergarten teacher at Frost elementary school. Today I'd like to model for you
subtracting within 10 on a number line.
Okay, today's problem is Tony had 9 packs of cards. He gave 4 packs away.
How many packs of cards does Tony have now? I
know that Tony had 9 packs of cards. I'm going to put a little dot on the number line on the 9. I
know that he gave 4 packs away. So I'm going to make 4 hops backwards on the number line. One,
two,
three,
four. And put a little dot on the five where I landed. I know that Tony had 9 packs of cards.
He gave four of them away. So I hopped backwards on the number line
to the five.
The five is how many packs he had left. I'm
going to write the equation now. Tony started with 9 packs of cards.
So I'm going to write the 9. And then to show that I'm subtracting
I'm going to use a minus sign. And
I hopped back four times. So he gave away four cards.
We're going to write the four. And I landed on the five, which is the answer to our
subtraction problem
