You counted the 4 puppies and 3 kittens in the pet store window. Circle the proportion that represents how many puppies are in the
entire store if there are 15 kittens?
Explain why you circled that proportion.
4
15
4
=
?
15
3

20 puppies

Step-by-step explanation:

So this is a proportion, or a ratio. There are 4 puppies to 3 kittens. We can write that as

4:3

Now, we want to find out how many puppies there are if there are 15 kittens. With a ratio, we want to keep the numbers proportional, and make sure they grow or shrink by the same amount. 15 is 3 x 5. So, the number we are multiplying our whole ratio by is 5.

4:3

?:15

20:15

So, there are 20 puppies.

the mistake in the pattern is that :

b. the decimal point was moved one too many place values each time

the correct pattern could be made by :

b. moving the decimal point to the right the same numbers of place values as the exponents