Hi, I'm Kelly Miller. I teach second grade at Flintstone Elementary. Today
I'm going to model how to subtract within one hundred using a number line.
Today's problem is Sally has 62 stuffed animals. She gave 24 to friends.
How many does she have left? I'm going to circle the important numbers in the problem
and I'm going to underline my question,
how many does she have left? And
I'm going to circle have left because that tells me that the problem is subtraction.
I'm going to start by writing the equation. I'm going to do 62
minus 24 equals.
And I'm going to leave that blank because we're going to use the number line to figure that out.
I'm going to start by drawing a line.
I'm going to put the number 62 all the way to the right.
I'm going to take two jumps back. I'm going to jump by 10.
So I'm showing I'm subtracting by 10. So 62 minus 10 is 52.
52 minus 10 is 42.
Now I'm going to jump back 4 times.
Going to subtract one so that shows subtracting 4. I
could also jump back
2 and then 2 again or I could do one jump
subtracting 4 and I land on the number 38. So I'm going to fill in my equation for the problem
62 minus 24 equals
38.
