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# 2.3: Teeter Totter

Difficulty Level: At Grade Created by: CK-12

Can you tell which animals weigh the same? Can you tell which animal weighs the least? In this concept, we will look at sets of teeter totters with animals on them and compare the weights of the animals.

### Guidance

When looking at a set of teeter totters like the one above, we learn different things from each picture. If the teeter totter is level, then we know that those two animals weigh the same. If the teeter totter is not level, then we know that the side lower to the ground has the animal that weighs more. We can combine this information to compare the weights of all three animals.

#### Example A

Look at the picture below. What do you see?

You should see a squirrel, a bat, and a lion. The squirrel is named Cynthia. The bat is named Bob. The lion is named Leonard.

Which two animals weigh the same?

You should see that the teeter totter is level in Picture A, so Cynthia and Bob weigh the same.

Which animal weighs more in Picture B? How can you tell from the picture?

You should notice that Leonard the lion weighs more because the lion side of the teeter totter is lower.

Who weighs the most?

Leonard the lion because the squirrel and the bat weigh the same. The lion weighs more than the squirrel, so he also weighs more than the bat. The lion weighs the most.

#### Example B

Look at the picture below. What do you see?

You should see a cat, a dog, and a raccoon. The cat is named Kit. The dog is named Donald. The raccoon is named Rafael.

Which picture shows that Kit the cat weighs less than Donald the dog? How can you tell from the picture?

We can see that Kit weighs less than Donald from picture B. This is because Donald the dog is on the bottom of the teeter totter and Kit the cat is on the higher side.

Which picture shows that Rafael the Raccoon weighs the same as Donald the Dog? How can you tell from the picture?

We can see that Rafael weighs the same as Donald from picture A because the teeter totter is not tipped.

Who weighs the least? How did you decide?

Kit the cat because the cat weighs less than the dog. Since the raccoon and the dog weigh the same, the cat also weighs less than the raccoon.

#### Concept Problem Revisited

You should see Roosevelt the rhinoceros, Donald the deer and Bernice the bear on teeter totters. We can see the Roosevelt the rhinoceros weighs less than Bernice the bear from picture A. We can see that Roosevelt the rhinoceros weighs the same as Donald the deer from picture B. Roosevelt the rhinoceros weighs the least because he weighs less than Bernice the bear and Bernice the bear weighs the same as Donald the deer. So Roosevelt the rhinoceros weighs less than Donald the deer. Roosevelt weighs the least.

### Vocabulary

To weigh more means to be heavier. To weigh less means to be lighter. We can compare the weights of objects by looking at them on a teeter totter.

### Guided Practice

1. Describe what you see in the picture.
2. Which two animals weigh the same? Which picture shows that they weigh the same?
3. Which animal weighs less than Horace the hippo? How can you tell from the picture?
4. Who weighs the least? How can you tell?

1. We see Horace the hippo, Ollie the otter and Wally the walrus on teeter totters.
2. Wally the walrus and Horace the hippo which we see in picture B.
3. Ollie the otter because Ollie’s side of the teeter totter is higher.
4. Ollie the otter since the walrus weighs the same as the hippo, and the hippo weighs more than the otter, then the walrus weighs more than the otter. So the otter weighs the least.

### Practice

1. Describe what you see in the picture.
2. Which two animals weigh the same? Which picture shows that they weigh the same?
3. Which animal weighs more than Orly the Otter? How can you tell from the picture?
4. Who weighs the most? How can you tell?

1. Describe what you see in the picture.
2. Which two animals weigh the same? Which picture shows that they weigh the same?
3. Which animal weighs less than Robbie the Rabbit? How can you tell from the picture?
4. Who weighs the least? How can you tell?

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Date Created:
Jan 18, 2013