Let’s Learn!
Can you use an open number line?
Goal:
Goal:
Think About It!
Goal: Learn how to use an open number line.
Super Bunny pulled 5 carrots out of the ground. Then, he pulled out 2 more carrots. How many carrots does Super Bunny have altogether? We can help Super Bunny by adding 5 + 2 on an open number line.
An open number line is an empty number line that can be used for addition or subtraction. It has an arrow on each end, but it is not labeled with numbers.
Let’s start adding! When we add on a number line, we jump to the right. Let’s set up this number line by drawing a dot on the left side of the number line and writing the larger addend under it. By drawing the dot on the left side, we leave room for our jumps going to the right.
The smaller addend tells us how many jumps to make on the open number line. Because we are adding, we will jump 2 times to the right.
Now let's label where the jumps touch the number line.
The sum is the number that the last jump lands on!
Super Bunny had 7 carrots, but he dropped 4. Can you use an open number line to subtract 7 - 4 ?
Let’s begin with this open number line.
When we subtract on a number line, we jump to the left. Let’s set up this number line by drawing a dot on the right side of the number line and writing the whole under it. By drawing the dot on the right side, we leave room for our jumps going to the left.
The part in the subtraction sentence tells us how many jumps to make on the open number line. Because we are subtracting, we will jump 4 times to the left.
Now let's label where the jumps touch the number line.
The difference is the number that the last jump lands on!
